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x Meter		The metre or meter (from the Greek μέτρον /΄metron/) is a unit of proper length. It is the basic unit of length in the metric system and in the International System of Units (SI), used around the world for general and scientific purposes....
x Kilogram		The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI, from the French Le Système International d’Unités). The kilogram is defined as being equal to the mass of the International Prototype Kilogram...
x Second		The second (SI symbol: s), sometimes abbreviated sec., is the name of a unit of time, and is the International System of Units (SI) base unit of time. It may be measured using a clock. SI prefixes are frequently combined with the word second to...
x Kelvin		The kelvin (symbol: K) is a unit increment of temperature and is one of the seven SI base units. The Kelvin scale is a thermodynamic (absolute) temperature scale where absolute zero, the theoretical absence of all thermal energy, is zero (0 K). The...
x Metre per second		Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector quantity which specifies both magnitude and a specific direction), defined by distance in metres divided by time in seconds. This is...
x Square meter		The square metre (also spelled square meter, see spelling differences) is the SI derived unit of area, with symbol m(33A1 in Unicode). It is defined as the area of a square whose sides measure exactly one metre. The square metre is derived from the...
x Cubic metre		The cubic metre (US spelling: cubic meter, symbol: m) is the SI derived unit of volume. It is the volume of a cube with edges one metre in length. An alternative name, which allowed a different usage with metric prefixes, was the stère. Another...
x Joule		The joule (symbol J) is the derived unit of energy in the International System of Units. It is the energy exerted by a force of one newton acting to move an object through a distance of one metre. Algebraically: One joule is the amount of energy...
x Pascal		The pascal (symbol: Pa) is the SI derived unit of pressure, stress, Young's modulus and tensile strength. It is a measure of force per unit area, equivalent to one newton per square metre or one joule per cubic metre. In everyday life, the pascal is...
x Hour		The hour (symbol: h) is a unit of time. It is not an SI unit but is accepted for use with the SI. In modern usage, an hour is a unit of time 60 minutes, or 3,600 seconds in length. It is 1/24 of a median Earth day. An hour on the UTC time scale can...
x Day		A day (symbol d) is a unit of time equivalent to approximately 24 hours. It is not an SI unit but it is accepted for use with SI. The SI unit of time is the second. The word 'day' can also refer to the (roughly) half of the day that is not night,...
x Minute		A minute is a unit of measurement of time or of angle. The minute is a unit of time equal to 1/60th of an hour or 60 seconds. In the UTC time scale, a minute occasionally has 59 or 61 seconds; see leap second. The minute is not an SI unit; however,...
x Kilometres per hour		The kilometre per hour (American English: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). The unit symbol is km/h or km·h; however, the colloquial abbreviations "kph" and "kmph" are sometimes also used in English-speaking...
x Miles per hour		The mile per hour is a unit of speed, expressing the number of international miles covered per hour. It is currently the unit used for speed limits, and speeds, on roads in the United Kingdom and United States. It is also used to express the speed...
x Watt		The watt (symbol: W) is a derived unit of power in the International System of Units (SI). It measures rate of energy conversion. One watt is equivalent to 1 joule (J) of energy per second. In terms of mechanical energy, one watt is the rate at...
x Byte		A byte (pronounced /ˈbaɪt/) is a basic unit of measurement of information storage in computer science. In many computer architectures it is a unit of memory addressing. There is no standard but a byte most often consists of eight bits. A byte is an...
x Kilogram per cubic metre		Kilogram per cubic metre is the SI measure of density and is represented as kg/m, where kg stands for kilogram and m stands for cubic metre. The density of water is about 1000 kg/m (and is exactly this at 277 K), since a cubic metre of water weighs...
x Newton		The newton (symbol: N) is the SI derived unit of force, named after Isaac Newton in recognition of his work on classical mechanics. The newton is the unit of force derived in the SI system; it is equal to the amount of force required to accelerate a...
x Gallon (US)		A gallon is a measure of volume of approximately four litres. Historically it has had many different definitions, but there are three definitions in current use. These are the U.S. liquid gallon (≈ 3.8 litres) and the U.S. dry gallon (≈ 4.4 L) which...
x Liter		The litre or liter (see spelling differences) is a unit of volume. There are two official symbols: the Latin letter L in lower and upper case (l and L). The lower case L is also often written as a cursive ℓ, though this symbol has no official...
x Pint (US)		The pint is an English unit of volume or capacity in the imperial system and United States customary units. The imperial version is 20 imperial fluid ounces and is equivalent to 568.26 mL, while the U.S. version is 16 U.S. fluid ounces and is...
x Quart (US)		The quart is an imperial and US customary unit of volume equal to a quarter of a gallon, two pints, or four cups. Since gallons of various sizes have historically been in use, quarts of various sizes have also existed. Three of these quarts remain...
x Fluid ounce (US)		A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl.) is a unit of volume equal to about 29 ml. It is used in both the imperial and the US customary systems, and it is commonly referred to simply as an ounce, especially in cases where no confusion...
x Milliliter		A milliliter is a metric unit of volume that is 1/1000 of a liter. It is the same as a cubic centimeter.
x Gallon (Imperial)		The Imperial gallon was based on the volume of 10 lb. of distilled water weighed in air with brass weights with the barometer standing at 30 inches of mercury and at a temperature of 62 °F. In 1963, this definition was refined as the space occupied...
x Pint (Imperial)		The imperial pint is a unit of volume or capacity that is equivalent to 20 UK fluid ounces or 0.56826125 litres.
x Pound		The pound or pound-mass (abbreviation: lb, lbm, or sometimes in the United States: #) is a unit of mass used in the imperial, United States customary and other systems of measurement. A number of different definitions have been used, the most common...
x Tonne		A tonne (t) or metric ton (U.S.), also referred to as a metric tonne, is a measurement of mass equal to 1,000 kg or 2,204.62262 lb, or approximately the mass of one cubic metre of water. It is not an SI unit but is accepted for use with the SI. If...
x Ounce		This article is about the unit of mass. For the unit of force, see Pound-force. For the unit of volume, see Fluid ounce. For all other uses, see Ounce (disambiguation). The ounce (abbreviated: oz, the old Italian word onza, now spelled oncia;...
x Long ton		Long ton, (weight ton, or imperial ton) is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements, as used in the United Kingdom and several other Commonwealth countries. It has been mostly replaced by the short...
x Short ton		The short ton (S/T) is a unit of weight equal to 2,000 pounds (907.18474 kg) . In the United States it is often called simply ton without distinguishing it from the metric ton (or tonne, 1,000 kilograms) or the long ton (2,240 pounds (1,020 kg));...
x Stone		The stone is a unit of weight, that is, the force the gravitational field of the Earth exerts on a mass. The Imperial unit of mass is the slug, which weighs 32.17405 pounds -- or 2.29815 stone -- in Earth's gravitational field. The stone is part of...
x Milligram		A milligram is a metric mass unit that is 1/1000th of a gram, or 1/1000000th of a kilogram.
x Gram		A Gram is a unit of measurement for mass (or weight). It is 1/1000th of a Kilogram.
x Microgram		A microgram is a Metric unit of weight that is 1/1000th of a milligram.
x Centimeter		A centimetre (American spelling: centimeter, symbol cm) is a unit of length in the metric system, equal to one hundredth of a metre, which is the current SI base unit of length. Centi is the SI prefix for a factor of 10. Hence a centimetre can be...
x Inch		An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ – a double prime) is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. There are 36 inches in a yard and...
x Mile		A mile is a unit of length, usually used to measure distance, in a number of different systems. In contemporary English contexts, mile most commonly refers to the statute mile of 5,280 feet (exactly 1,609.344 meters) or the nautical mile of 1,852...
x Micrometer		A micrometre or micron (American spelling: micrometer; symbol µm) is one millionth of a metre, or equivalently one thousandth of a millimetre. It can be written in scientific notation as 1×10 m, meaning ⁄1000000 m. A strand of human hair is about...
x Yard		A yard (abbreviation: yd) is a unit of length in several different systems, including English units, Imperial units, and United States customary units. It is equal to 3 feet or 36 inches, although its length in SI units varied slightly from system...
x Kilometer		The kilometre (American spelling: kilometer), symbol km is a unit of length in the metric system, equal to one thousand metres and is therefore exactly equal to the distance travelled by light in free space in ⁄ 299,792.458 of a second It is the...
x Millimeter		The millimetre (American spelling: millimeter, symbol mm) is a unit of length in the metric system, equal to one thousandth of a metre, which is the current SI base unit of length. For the purposes of compatibility with Chinese, Japanese and Korean ...
x Ångström		The ångström or angstrom (symbol Å) (pronounced /ˈɔːŋstrəm/; Swedish: IPA: [ˈɔŋstrœm]) is an internationally recognized non-SI unit of length equal to 0.1 nanometre or 1 × 10 metres (there are 10 billion of these in a metre). It is sometimes used in...
x Foot		A foot (plural: feet or foot; symbol or abbreviation: ft or, sometimes, ′ – the prime symbol) is a non-SI unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. Its size can vary...
x Hectare		A hectare (symbol ha, pronounced /ˈhɛktɛər/) is a unit of area equal to 10,000 square metres (107,639 sq ft), or one square hectometre (100 metres, squared), and commonly used for measuring land area. The hectare is used in most countries around the...
x Square kilometer		Square kilometre (U.S. spelling: square kilometer), symbol km, is a decimal multiple of the SI unit of surface area, the square metre, one of the SI derived units. 1 km is equal to: Conversely: Note: "km" means (km), square kilometre or kilometre...
x Square mile		The square mile (sometimes written as mi²) is an imperial and US unit of measure for an area equal to the area of a square of one statute mile. It should not be confused with miles square, which refers to the number of miles on each side squared....
x Square yard		The square yard is an imperial/US customary (non-metric) unit of area, formerly used in most of the English-speaking world but now generally replaced by the square metre outside of the US. It is defined as the area of a square with sides of one yard...
x Degree Celsius		Celsius (also known as centigrade) is a temperature scale that is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale two years before his death. The degree Celsius (°C) can refer to a specific...
x Degree Fahrenheit		Fahrenheit usually refers to a temperature scale proposed in 1724 by, and named after, the physicist Daniel Gabriel Fahrenheit (1686–1736). Today, the scale has been replaced by the Celsius scale in most countries; it is still in use for non...
x Degree Rankine		Rankine is a thermodynamic (absolute) temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859. The symbol is R (or Ra if to distinguish it from the Rømer and Réaumur scales). As with...
x Calorie		The calorie is a pre-SI metric unit of energy. The unit was first defined by Professor Nicolas Clément in 1824 as a unit of heat. This definition entered French and English dictionaries between 1841 and 1867. In most fields its use is archaic,...
x Watt-hour		The kilowatt hour, also written kilowatt-hour (symbol kW·h, kW h or kWh) is a unit of energy equal to 3.6 megajoules. Energy delivered by electric utilities is usually expressed and charged for in kilowatt hours. Energy in kilowatt hours is the...
x Pound-force per square inch		The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in² or lbf/in²) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an...
x Torr		The torr (symbol: Torr) is a non-SI unit of pressure defined as ⁄760 of a standard atmosphere, chosen to be roughly equal to the fluid pressure exerted by a millimeter of mercury. Note that the symbol is spelled exactly the same as the unit, but the...
x Bar		The bar (symbol bar), decibar (symbol dbar), centibar (symbol cbar), and millibar (symbol mbar or mb) are units of pressure. They are not SI units, nor are they cgs units, but they are accepted for use with the SI by NIST. The bar is widely used in...
x Atmosphere		The standard atmosphere is an international reference pressure defined as 101,325 Pa and formerly used as unit of pressure (symbol: atm). For practical purposes it has been replaced by the bar which is 100,000 Pa. The difference of about 1% is not...
x Mechanical horsepower		The term horsepower was invented by the engineer James Watt in 1782. Watt (1736 to 1819) is most famous for his work on improving the performance of steam engines. Watt was working with ponies lifting coal at a coal mine, and he wanted to define the...
x Metric horsepower		Metric horsepower began in Germany in the 19th century and became popular across Europe and Asia. The various units used to indicate this definition ("PS", "CV", "pk", and "ch") all translate to "horse power" in English, so it is common to see these...
x Boiler horsepower		(From Wikipedia, “Horsepower.”)

x Meter

The metre or meter (from the Greek μέτρον /΄metron/) is a unit of proper length. It is the basic unit of length in the metric system and in the International System of Units (SI), used around the world for general and scientific purposes....

x Kilogram

The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI, from the French Le Système International d’Unités). The kilogram is defined as being equal to the mass of the International Prototype Kilogram...

x Second

The second (SI symbol: s), sometimes abbreviated sec., is the name of a unit of time, and is the International System of Units (SI) base unit of time. It may be measured using a clock. SI prefixes are frequently combined with the word second to...

x Kelvin

The kelvin (symbol: K) is a unit increment of temperature and is one of the seven SI base units. The Kelvin scale is a thermodynamic (absolute) temperature scale where absolute zero, the theoretical absence of all thermal energy, is zero (0 K). The...

x Metre per second

Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector quantity which specifies both magnitude and a specific direction), defined by distance in metres divided by time in seconds. This is...

x Square meter

The square metre (also spelled square meter, see spelling differences) is the SI derived unit of area, with symbol m(33A1 in Unicode). It is defined as the area of a square whose sides measure exactly one metre. The square metre is derived from the...

x Cubic metre

The cubic metre (US spelling: cubic meter, symbol: m) is the SI derived unit of volume. It is the volume of a cube with edges one metre in length. An alternative name, which allowed a different usage with metric prefixes, was the stère. Another...

x Joule

The joule (symbol J) is the derived unit of energy in the International System of Units. It is the energy exerted by a force of one newton acting to move an object through a distance of one metre. Algebraically: One joule is the amount of energy...

x Pascal

The pascal (symbol: Pa) is the SI derived unit of pressure, stress, Young's modulus and tensile strength. It is a measure of force per unit area, equivalent to one newton per square metre or one joule per cubic metre. In everyday life, the pascal is...

x Hour

The hour (symbol: h) is a unit of time. It is not an SI unit but is accepted for use with the SI. In modern usage, an hour is a unit of time 60 minutes, or 3,600 seconds in length. It is 1/24 of a median Earth day. An hour on the UTC time scale can...

x Day

A day (symbol d) is a unit of time equivalent to approximately 24 hours. It is not an SI unit but it is accepted for use with SI. The SI unit of time is the second. The word 'day' can also refer to the (roughly) half of the day that is not night,...

x Minute

A minute is a unit of measurement of time or of angle. The minute is a unit of time equal to 1/60th of an hour or 60 seconds. In the UTC time scale, a minute occasionally has 59 or 61 seconds; see leap second. The minute is not an SI unit; however,...

x Kilometres per hour

The kilometre per hour (American English: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). The unit symbol is km/h or km·h; however, the colloquial abbreviations "kph" and "kmph" are sometimes also used in English-speaking...

x Miles per hour

The mile per hour is a unit of speed, expressing the number of international miles covered per hour. It is currently the unit used for speed limits, and speeds, on roads in the United Kingdom and United States. It is also used to express the speed...

x Watt

The watt (symbol: W) is a derived unit of power in the International System of Units (SI). It measures rate of energy conversion. One watt is equivalent to 1 joule (J) of energy per second. In terms of mechanical energy, one watt is the rate at...

x Byte

A byte (pronounced /ˈbaɪt/) is a basic unit of measurement of information storage in computer science. In many computer architectures it is a unit of memory addressing. There is no standard but a byte most often consists of eight bits. A byte is an...

x Kilogram per cubic metre

Kilogram per cubic metre is the SI measure of density and is represented as kg/m, where kg stands for kilogram and m stands for cubic metre. The density of water is about 1000 kg/m (and is exactly this at 277 K), since a cubic metre of water weighs...

x Newton

The newton (symbol: N) is the SI derived unit of force, named after Isaac Newton in recognition of his work on classical mechanics. The newton is the unit of force derived in the SI system; it is equal to the amount of force required to accelerate a...

x Gallon (US)

A gallon is a measure of volume of approximately four litres. Historically it has had many different definitions, but there are three definitions in current use. These are the U.S. liquid gallon (≈ 3.8 litres) and the U.S. dry gallon (≈ 4.4 L) which...

x Liter

The litre or liter (see spelling differences) is a unit of volume. There are two official symbols: the Latin letter L in lower and upper case (l and L). The lower case L is also often written as a cursive ℓ, though this symbol has no official...

x Pint (US)

The pint is an English unit of volume or capacity in the imperial system and United States customary units. The imperial version is 20 imperial fluid ounces and is equivalent to 568.26 mL, while the U.S. version is 16 U.S. fluid ounces and is...

x Quart (US)

The quart is an imperial and US customary unit of volume equal to a quarter of a gallon, two pints, or four cups. Since gallons of various sizes have historically been in use, quarts of various sizes have also existed. Three of these quarts remain...

x Fluid ounce (US)

A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl.) is a unit of volume equal to about 29 ml. It is used in both the imperial and the US customary systems, and it is commonly referred to simply as an ounce, especially in cases where no confusion...

x Milliliter

A milliliter is a metric unit of volume that is 1/1000 of a liter. It is the same as a cubic centimeter.

x Gallon (Imperial)

The Imperial gallon was based on the volume of 10 lb. of distilled water weighed in air with brass weights with the barometer standing at 30 inches of mercury and at a temperature of 62 °F. In 1963, this definition was refined as the space occupied...

x Pint (Imperial)

The imperial pint is a unit of volume or capacity that is equivalent to 20 UK fluid ounces or 0.56826125 litres.

x Pound

The pound or pound-mass (abbreviation: lb, lbm, or sometimes in the United States: #) is a unit of mass used in the imperial, United States customary and other systems of measurement. A number of different definitions have been used, the most common...

x Tonne

A tonne (t) or metric ton (U.S.), also referred to as a metric tonne, is a measurement of mass equal to 1,000 kg or 2,204.62262 lb, or approximately the mass of one cubic metre of water. It is not an SI unit but is accepted for use with the SI. If...

x Ounce

This article is about the unit of mass. For the unit of force, see Pound-force. For the unit of volume, see Fluid ounce. For all other uses, see Ounce (disambiguation). The ounce (abbreviated: oz, the old Italian word onza, now spelled oncia;...

x Long ton

Long ton, (weight ton, or imperial ton) is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements, as used in the United Kingdom and several other Commonwealth countries. It has been mostly replaced by the short...

x Short ton

The short ton (S/T) is a unit of weight equal to 2,000 pounds (907.18474 kg) . In the United States it is often called simply ton without distinguishing it from the metric ton (or tonne, 1,000 kilograms) or the long ton (2,240 pounds (1,020 kg));...

x Stone

The stone is a unit of weight, that is, the force the gravitational field of the Earth exerts on a mass. The Imperial unit of mass is the slug, which weighs 32.17405 pounds -- or 2.29815 stone -- in Earth's gravitational field. The stone is part of...

x Milligram

A milligram is a metric mass unit that is 1/1000th of a gram, or 1/1000000th of a kilogram.

x Gram

A Gram is a unit of measurement for mass (or weight). It is 1/1000th of a Kilogram.

x Microgram

A microgram is a Metric unit of weight that is 1/1000th of a milligram.

x Centimeter

A centimetre (American spelling: centimeter, symbol cm) is a unit of length in the metric system, equal to one hundredth of a metre, which is the current SI base unit of length. Centi is the SI prefix for a factor of 10. Hence a centimetre can be...

x Inch

An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ – a double prime) is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. There are 36 inches in a yard and...

x Mile

A mile is a unit of length, usually used to measure distance, in a number of different systems. In contemporary English contexts, mile most commonly refers to the statute mile of 5,280 feet (exactly 1,609.344 meters) or the nautical mile of 1,852...

x Micrometer

A micrometre or micron (American spelling: micrometer; symbol µm) is one millionth of a metre, or equivalently one thousandth of a millimetre. It can be written in scientific notation as 1×10 m, meaning ⁄1000000 m. A strand of human hair is about...

x Yard

A yard (abbreviation: yd) is a unit of length in several different systems, including English units, Imperial units, and United States customary units. It is equal to 3 feet or 36 inches, although its length in SI units varied slightly from system...

x Kilometer

The kilometre (American spelling: kilometer), symbol km is a unit of length in the metric system, equal to one thousand metres and is therefore exactly equal to the distance travelled by light in free space in ⁄ 299,792.458 of a second It is the...

x Millimeter

The millimetre (American spelling: millimeter, symbol mm) is a unit of length in the metric system, equal to one thousandth of a metre, which is the current SI base unit of length. For the purposes of compatibility with Chinese, Japanese and Korean ...

x Ångström

The ångström or angstrom (symbol Å) (pronounced /ˈɔːŋstrəm/; Swedish: IPA: [ˈɔŋstrœm]) is an internationally recognized non-SI unit of length equal to 0.1 nanometre or 1 × 10 metres (there are 10 billion of these in a metre). It is sometimes used in...

x Foot

A foot (plural: feet or foot; symbol or abbreviation: ft or, sometimes, ′ – the prime symbol) is a non-SI unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. Its size can vary...

x Hectare

A hectare (symbol ha, pronounced /ˈhɛktɛər/) is a unit of area equal to 10,000 square metres (107,639 sq ft), or one square hectometre (100 metres, squared), and commonly used for measuring land area. The hectare is used in most countries around the...

x Square kilometer

Square kilometre (U.S. spelling: square kilometer), symbol km, is a decimal multiple of the SI unit of surface area, the square metre, one of the SI derived units. 1 km is equal to: Conversely: Note: "km" means (km), square kilometre or kilometre...

x Square mile

The square mile (sometimes written as mi²) is an imperial and US unit of measure for an area equal to the area of a square of one statute mile. It should not be confused with miles square, which refers to the number of miles on each side squared....

x Square yard

The square yard is an imperial/US customary (non-metric) unit of area, formerly used in most of the English-speaking world but now generally replaced by the square metre outside of the US. It is defined as the area of a square with sides of one yard...

x Degree Celsius

Celsius (also known as centigrade) is a temperature scale that is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale two years before his death. The degree Celsius (°C) can refer to a specific...

x Degree Fahrenheit

Fahrenheit usually refers to a temperature scale proposed in 1724 by, and named after, the physicist Daniel Gabriel Fahrenheit (1686–1736). Today, the scale has been replaced by the Celsius scale in most countries; it is still in use for non...

x Degree Rankine

Rankine is a thermodynamic (absolute) temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859. The symbol is R (or Ra if to distinguish it from the Rømer and Réaumur scales). As with...

x Calorie

The calorie is a pre-SI metric unit of energy. The unit was first defined by Professor Nicolas Clément in 1824 as a unit of heat. This definition entered French and English dictionaries between 1841 and 1867. In most fields its use is archaic,...

x Watt-hour

The kilowatt hour, also written kilowatt-hour (symbol kW·h, kW h or kWh) is a unit of energy equal to 3.6 megajoules. Energy delivered by electric utilities is usually expressed and charged for in kilowatt hours. Energy in kilowatt hours is the...

x Pound-force per square inch

The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in² or lbf/in²) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an...

x Torr

The torr (symbol: Torr) is a non-SI unit of pressure defined as ⁄760 of a standard atmosphere, chosen to be roughly equal to the fluid pressure exerted by a millimeter of mercury. Note that the symbol is spelled exactly the same as the unit, but the...

x Bar

The bar (symbol bar), decibar (symbol dbar), centibar (symbol cbar), and millibar (symbol mbar or mb) are units of pressure. They are not SI units, nor are they cgs units, but they are accepted for use with the SI by NIST. The bar is widely used in...

x Atmosphere

The standard atmosphere is an international reference pressure defined as 101,325 Pa and formerly used as unit of pressure (symbol: atm). For practical purposes it has been replaced by the bar which is 100,000 Pa. The difference of about 1% is not...

x Mechanical horsepower

The term horsepower was invented by the engineer James Watt in 1782. Watt (1736 to 1819) is most famous for his work on improving the performance of steam engines. Watt was working with ponies lifting coal at a coal mine, and he wanted to define the...

x Metric horsepower

Metric horsepower began in Germany in the 19th century and became popular across Europe and Asia. The various units used to indicate this definition ("PS", "CV", "pk", and "ch") all translate to "horse power" in English, so it is common to see these...

x Boiler horsepower

(From Wikipedia, “Horsepower.”)

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x Meter		The metre or meter (from the Greek μέτρον /΄metron/) is a unit of proper length. It is the basic unit of length in the metric system and in the International System of Units (SI), used around the world for general and scientific purposes....
x Kilogram		The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI, from the French Le Système International d’Unités). The kilogram is defined as being equal to the mass of the International Prototype Kilogram...
x Second		The second (SI symbol: s), sometimes abbreviated sec., is the name of a unit of time, and is the International System of Units (SI) base unit of time. It may be measured using a clock. SI prefixes are frequently combined with the word second to...
x Kelvin		The kelvin (symbol: K) is a unit increment of temperature and is one of the seven SI base units. The Kelvin scale is a thermodynamic (absolute) temperature scale where absolute zero, the theoretical absence of all thermal energy, is zero (0 K). The...
x Metre per second		Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector quantity which specifies both magnitude and a specific direction), defined by distance in metres divided by time in seconds. This is...
x Square meter		The square metre (also spelled square meter, see spelling differences) is the SI derived unit of area, with symbol m(33A1 in Unicode). It is defined as the area of a square whose sides measure exactly one metre. The square metre is derived from the...
x Cubic metre		The cubic metre (US spelling: cubic meter, symbol: m) is the SI derived unit of volume. It is the volume of a cube with edges one metre in length. An alternative name, which allowed a different usage with metric prefixes, was the stère. Another...
x Joule		The joule (symbol J) is the derived unit of energy in the International System of Units. It is the energy exerted by a force of one newton acting to move an object through a distance of one metre. Algebraically: One joule is the amount of energy...
x Pascal		The pascal (symbol: Pa) is the SI derived unit of pressure, stress, Young's modulus and tensile strength. It is a measure of force per unit area, equivalent to one newton per square metre or one joule per cubic metre. In everyday life, the pascal is...
x Hour		The hour (symbol: h) is a unit of time. It is not an SI unit but is accepted for use with the SI. In modern usage, an hour is a unit of time 60 minutes, or 3,600 seconds in length. It is 1/24 of a median Earth day. An hour on the UTC time scale can...
x Day		A day (symbol d) is a unit of time equivalent to approximately 24 hours. It is not an SI unit but it is accepted for use with SI. The SI unit of time is the second. The word 'day' can also refer to the (roughly) half of the day that is not night,...
x Minute		A minute is a unit of measurement of time or of angle. The minute is a unit of time equal to 1/60th of an hour or 60 seconds. In the UTC time scale, a minute occasionally has 59 or 61 seconds; see leap second. The minute is not an SI unit; however,...
x Kilometres per hour		The kilometre per hour (American English: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). The unit symbol is km/h or km·h; however, the colloquial abbreviations "kph" and "kmph" are sometimes also used in English-speaking...
x Miles per hour		The mile per hour is a unit of speed, expressing the number of international miles covered per hour. It is currently the unit used for speed limits, and speeds, on roads in the United Kingdom and United States. It is also used to express the speed...
x Watt		The watt (symbol: W) is a derived unit of power in the International System of Units (SI). It measures rate of energy conversion. One watt is equivalent to 1 joule (J) of energy per second. In terms of mechanical energy, one watt is the rate at...
x Byte		A byte (pronounced /ˈbaɪt/) is a basic unit of measurement of information storage in computer science. In many computer architectures it is a unit of memory addressing. There is no standard but a byte most often consists of eight bits. A byte is an...
x Kilogram per cubic metre		Kilogram per cubic metre is the SI measure of density and is represented as kg/m, where kg stands for kilogram and m stands for cubic metre. The density of water is about 1000 kg/m (and is exactly this at 277 K), since a cubic metre of water weighs...
x Newton		The newton (symbol: N) is the SI derived unit of force, named after Isaac Newton in recognition of his work on classical mechanics. The newton is the unit of force derived in the SI system; it is equal to the amount of force required to accelerate a...
x Gallon (US)		A gallon is a measure of volume of approximately four litres. Historically it has had many different definitions, but there are three definitions in current use. These are the U.S. liquid gallon (≈ 3.8 litres) and the U.S. dry gallon (≈ 4.4 L) which...
x Liter		The litre or liter (see spelling differences) is a unit of volume. There are two official symbols: the Latin letter L in lower and upper case (l and L). The lower case L is also often written as a cursive ℓ, though this symbol has no official...
x Pint (US)		The pint is an English unit of volume or capacity in the imperial system and United States customary units. The imperial version is 20 imperial fluid ounces and is equivalent to 568.26 mL, while the U.S. version is 16 U.S. fluid ounces and is...
x Quart (US)		The quart is an imperial and US customary unit of volume equal to a quarter of a gallon, two pints, or four cups. Since gallons of various sizes have historically been in use, quarts of various sizes have also existed. Three of these quarts remain...
x Fluid ounce (US)		A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl.) is a unit of volume equal to about 29 ml. It is used in both the imperial and the US customary systems, and it is commonly referred to simply as an ounce, especially in cases where no confusion...
x Milliliter		A milliliter is a metric unit of volume that is 1/1000 of a liter. It is the same as a cubic centimeter.
x Gallon (Imperial)		The Imperial gallon was based on the volume of 10 lb. of distilled water weighed in air with brass weights with the barometer standing at 30 inches of mercury and at a temperature of 62 °F. In 1963, this definition was refined as the space occupied...
x Pint (Imperial)		The imperial pint is a unit of volume or capacity that is equivalent to 20 UK fluid ounces or 0.56826125 litres.
x Pound		The pound or pound-mass (abbreviation: lb, lbm, or sometimes in the United States: #) is a unit of mass used in the imperial, United States customary and other systems of measurement. A number of different definitions have been used, the most common...
x Tonne		A tonne (t) or metric ton (U.S.), also referred to as a metric tonne, is a measurement of mass equal to 1,000 kg or 2,204.62262 lb, or approximately the mass of one cubic metre of water. It is not an SI unit but is accepted for use with the SI. If...
x Ounce		This article is about the unit of mass. For the unit of force, see Pound-force. For the unit of volume, see Fluid ounce. For all other uses, see Ounce (disambiguation). The ounce (abbreviated: oz, the old Italian word onza, now spelled oncia;...
x Long ton		Long ton, (weight ton, or imperial ton) is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements, as used in the United Kingdom and several other Commonwealth countries. It has been mostly replaced by the short...
x Short ton		The short ton (S/T) is a unit of weight equal to 2,000 pounds (907.18474 kg) . In the United States it is often called simply ton without distinguishing it from the metric ton (or tonne, 1,000 kilograms) or the long ton (2,240 pounds (1,020 kg));...
x Stone		The stone is a unit of weight, that is, the force the gravitational field of the Earth exerts on a mass. The Imperial unit of mass is the slug, which weighs 32.17405 pounds -- or 2.29815 stone -- in Earth's gravitational field. The stone is part of...
x Milligram		A milligram is a metric mass unit that is 1/1000th of a gram, or 1/1000000th of a kilogram.
x Gram		A Gram is a unit of measurement for mass (or weight). It is 1/1000th of a Kilogram.
x Microgram		A microgram is a Metric unit of weight that is 1/1000th of a milligram.
x Centimeter		A centimetre (American spelling: centimeter, symbol cm) is a unit of length in the metric system, equal to one hundredth of a metre, which is the current SI base unit of length. Centi is the SI prefix for a factor of 10. Hence a centimetre can be...
x Inch		An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ – a double prime) is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. There are 36 inches in a yard and...
x Mile		A mile is a unit of length, usually used to measure distance, in a number of different systems. In contemporary English contexts, mile most commonly refers to the statute mile of 5,280 feet (exactly 1,609.344 meters) or the nautical mile of 1,852...
x Micrometer		A micrometre or micron (American spelling: micrometer; symbol µm) is one millionth of a metre, or equivalently one thousandth of a millimetre. It can be written in scientific notation as 1×10 m, meaning ⁄1000000 m. A strand of human hair is about...
x Yard		A yard (abbreviation: yd) is a unit of length in several different systems, including English units, Imperial units, and United States customary units. It is equal to 3 feet or 36 inches, although its length in SI units varied slightly from system...
x Kilometer		The kilometre (American spelling: kilometer), symbol km is a unit of length in the metric system, equal to one thousand metres and is therefore exactly equal to the distance travelled by light in free space in ⁄ 299,792.458 of a second It is the...
x Millimeter		The millimetre (American spelling: millimeter, symbol mm) is a unit of length in the metric system, equal to one thousandth of a metre, which is the current SI base unit of length. For the purposes of compatibility with Chinese, Japanese and Korean ...
x Ångström		The ångström or angstrom (symbol Å) (pronounced /ˈɔːŋstrəm/; Swedish: IPA: [ˈɔŋstrœm]) is an internationally recognized non-SI unit of length equal to 0.1 nanometre or 1 × 10 metres (there are 10 billion of these in a metre). It is sometimes used in...
x Foot		A foot (plural: feet or foot; symbol or abbreviation: ft or, sometimes, ′ – the prime symbol) is a non-SI unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. Its size can vary...
x Hectare		A hectare (symbol ha, pronounced /ˈhɛktɛər/) is a unit of area equal to 10,000 square metres (107,639 sq ft), or one square hectometre (100 metres, squared), and commonly used for measuring land area. The hectare is used in most countries around the...
x Square kilometer		Square kilometre (U.S. spelling: square kilometer), symbol km, is a decimal multiple of the SI unit of surface area, the square metre, one of the SI derived units. 1 km is equal to: Conversely: Note: "km" means (km), square kilometre or kilometre...
x Square mile		The square mile (sometimes written as mi²) is an imperial and US unit of measure for an area equal to the area of a square of one statute mile. It should not be confused with miles square, which refers to the number of miles on each side squared....
x Square yard		The square yard is an imperial/US customary (non-metric) unit of area, formerly used in most of the English-speaking world but now generally replaced by the square metre outside of the US. It is defined as the area of a square with sides of one yard...
x Degree Celsius		Celsius (also known as centigrade) is a temperature scale that is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale two years before his death. The degree Celsius (°C) can refer to a specific...
x Degree Fahrenheit		Fahrenheit usually refers to a temperature scale proposed in 1724 by, and named after, the physicist Daniel Gabriel Fahrenheit (1686–1736). Today, the scale has been replaced by the Celsius scale in most countries; it is still in use for non...
x Degree Rankine		Rankine is a thermodynamic (absolute) temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859. The symbol is R (or Ra if to distinguish it from the Rømer and Réaumur scales). As with...
x Calorie		The calorie is a pre-SI metric unit of energy. The unit was first defined by Professor Nicolas Clément in 1824 as a unit of heat. This definition entered French and English dictionaries between 1841 and 1867. In most fields its use is archaic,...
x Watt-hour		The kilowatt hour, also written kilowatt-hour (symbol kW·h, kW h or kWh) is a unit of energy equal to 3.6 megajoules. Energy delivered by electric utilities is usually expressed and charged for in kilowatt hours. Energy in kilowatt hours is the...
x Pound-force per square inch		The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in² or lbf/in²) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an...
x Torr		The torr (symbol: Torr) is a non-SI unit of pressure defined as ⁄760 of a standard atmosphere, chosen to be roughly equal to the fluid pressure exerted by a millimeter of mercury. Note that the symbol is spelled exactly the same as the unit, but the...
x Bar		The bar (symbol bar), decibar (symbol dbar), centibar (symbol cbar), and millibar (symbol mbar or mb) are units of pressure. They are not SI units, nor are they cgs units, but they are accepted for use with the SI by NIST. The bar is widely used in...
x Atmosphere		The standard atmosphere is an international reference pressure defined as 101,325 Pa and formerly used as unit of pressure (symbol: atm). For practical purposes it has been replaced by the bar which is 100,000 Pa. The difference of about 1% is not...
x Mechanical horsepower		The term horsepower was invented by the engineer James Watt in 1782. Watt (1736 to 1819) is most famous for his work on improving the performance of steam engines. Watt was working with ponies lifting coal at a coal mine, and he wanted to define the...
x Metric horsepower		Metric horsepower began in Germany in the 19th century and became popular across Europe and Asia. The various units used to indicate this definition ("PS", "CV", "pk", and "ch") all translate to "horse power" in English, so it is common to see these...
x Boiler horsepower		(From Wikipedia, “Horsepower.”)

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