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Filter this Collection| x name | x image | x SI Base Unit | x Units | x Instruments | x article |
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| x Length | Meter | Meter |
Length is the long dimension of any object. Not to be confused with Depth which is the property of the object that appears to go away from the observer. The length of a thing is the distance between its ends, its linear extent as measured from end...
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| Centimeter | |||||
| Inch | |||||
| Mile | |||||
| Micrometer | |||||
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| x Mass |
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Kilogram | Electron rest mass |
For other "mass", see Mass (disambiguation)
In physics, mass (from Ancient Greek: μᾶζα) commonly refers to any of three properties of matter, which have been shown experimentally to be equivalent: inertial mass, active gravitational mass and passive...
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| Planck mass | |||||
| Pennyweight | |||||
| Grain | |||||
| Microgram | |||||
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| x Time |
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Second | Second | Clock |
Time is a component of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects. Time has been a major subject of religion, philosophy, and science, but...
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| Year | Cuckoo clock | ||||
| Tropical year | |||||
| Leap year | |||||
| Julian year | |||||
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| x Electric current |
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Ampere | Ampere | Ammeter |
Electric current can mean, depending on the context, a flow of electric charge (a phenomenon) or the rate of flow of electric charge (a quantity). The electric charge that flows is carried by, for example, mobile electrons in a conductor, ions in an...
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| Abampere | Zero resistance ammeter | ||||
| Planck current | |||||
| x Temperature |
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Kelvin | Kelvin | Thermometer |
In physics, temperature is a physical property of a system that underlies the common notions of hot and cold; something that feels hotter generally has the higher temperature. Temperature is one of the principal parameters of thermodynamics. If no...
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| Degree Celsius | |||||
| Degree Fahrenheit | |||||
| Degree Rankine | |||||
| x Amount of substance | Mole | Mole |
In physical sciences, the amount of substance, n, of a sample can be defined informally as the number of some specified elementary entities (usually either atoms, or molecules, or ions, or electrons) present in the sample, but where this number is...
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| Pound mole | |||||
| Micromole | |||||
| Nanomole | |||||
| Millimole | |||||
| x Luminous intensity |
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Candela | Candela |
In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The...
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| x Area |
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Square meter | Square meter |
Area is a quantity expressing the two-dimensional size of a defined part of a surface, typically a region bounded by a closed curve. The term surface area refers to the total area of the exposed surface of a 3-dimensional solid, such as the sum of...
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| Acre | |||||
| US survey acre | |||||
| Hectare | |||||
| Square kilometer | |||||
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| x Volume | Cubic metre | Barrel (US Oil) |
The volume of any solid, liquid, gas, object, or vacuum is how much space it occupies. Figures (such as lines) and two-dimensional shapes (such as squares) are assigned zero volume in the three-dimensional space. Volume is commonly presented in...
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| Cubic metre | |||||
| Gallon (US) | |||||
| Liter | |||||
| Pint (US) | |||||
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| x Speed | Metre per second | Kilometres per second |
Speed is the rate of motion, or equivalently the rate of change of distance.
Speed is a scalar quantity with dimensions length/time; the equivalent vector quantity to speed is velocity. Speed is measured in the same physical units of measurement as...
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| Metre per second | |||||
| Miles per hour | |||||
| Kilometres per hour | |||||
| Knot | |||||
| x Acceleration |
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Metre per second squared | Metre per second squared |
In physics, and more specifically kinematics, acceleration is the change in velocity over time. Because velocity is a vector, it can change in two ways: a change in magnitude and/or a change in direction. In one dimension, i.e. a line, acceleration...
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| g-force | |||||
| Gal | |||||
| x Wavenumber | Reciprocal metre | Reciprocal metre |
Wavenumber in most physical sciences is a wave property inversely related to wavelength, having SI units of reciprocal meters (m). Wavenumber is the spatial analog of frequency, that is, it is the measurement of the number of wavelengths per unit...
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| x Density |
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Kilogram per cubic metre | Kilogram per cubic metre |
The density of a material is defined as its mass per unit volume. The symbol of density is ρ (the Greek letter rho).
Mathematically:
where:
Different materials usually have different densities, so density is an important concept regarding buoyancy,...
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| grams per cubic centimeter | |||||
| x Surface density | Kilogram per square metre | Kilogram per square metre | |||
| x Specific volume | Cubic metre per kilogram | Cubic metre per kilogram |
Specific volume (ν) is the volume occupied by a unit of mass of a material. It is equal to the inverse of density. Specific volume may be expressed in , or .
where, V is the volume, m is the mass and ρ is the density of the material.
For an ideal...
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| x Current density | Ampere per square metre | Ampere per square metre |
Current density is a measure of the density of flow of a conserved charge. Usually the charge is the electric charge, in which case the associated current density is the electric current per unit area of cross section, but the term current density...
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| x Magnetic field strength | Ampere per metre | Ampere per metre | |||
| Oersted | |||||
| x Luminance | Candela per square metre | Candela per square metre |
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The...
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| x Angle | Radian | Radian | Protractor |
In geometry and trigonometry, an angle (in full, plane angle) is the figure formed by two rays sharing a common endpoint, called the vertex of the angle (Sidorov 2001). The magnitude of the angle is the "amount of rotation" that separates the two...
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| Degree | |||||
| Grad | |||||
| Angular mil | |||||
| Turn | |||||
| more ▼ | |||||
| x Solid angle |
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Steradian | Steradian |
The solid angle, Ω, is the two-dimensional angle in three-dimensional space that an object subtends at a point. It is a measure of how large that object appears to an observer looking from that point. A small object nearby may subtend the same solid...
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| Square degree | |||||
| x Frequency | Hertz | Hertz |
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency.
For cyclical...
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| Weekly | |||||
| Daily | |||||
| Once every two months | |||||
| Once every two weeks | |||||
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| x Force |
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Newton | Newton |
In physics, a force has the capacity to change the motion of a free body or cause stress in a fixed body. It can also be described by intuitive concepts such as a push or pull that can cause an object with mass to change its velocity (which includes...
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| Dyne | |||||
| Pound-force | |||||
| Kilogram-force | |||||
| Poundal | |||||
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| x Pressure |
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Pascal | Pascal |
Pressure (symbol: P) is the force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.
Pressure is an effect which occurs when a force...
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| Pound-force per square inch | |||||
| Torr | |||||
| Bar | |||||
| Atmosphere | |||||
| more ▼ | |||||
| x Energy |
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Joule | Kilowatt-hour |
In physics, energy (from the Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working") is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and...
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| Joule | |||||
| Calorie | |||||
| Watt-hour | |||||
| Erg | |||||
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| x Power |
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Watt | Solar luminosity |
In physics, power is the rate at which work is performed or energy is converted. It is an energy per unit of time. As a rate of change of work done or the energy of a subsystem, power is
where P is power, W is work and t is time.
The average power ...
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| Watt | |||||
| Mechanical horsepower | |||||
| Metric horsepower | |||||
| Boiler horsepower | |||||
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| x Electric charge |
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Coulomb | Milliampere-hour |
Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. Electrically charged matter is influenced by, and produces, electromagnetic fields. The interaction between a moving...
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| Coulomb | |||||
| Ampere-hour | |||||
| Elementary charge | |||||
| Statcoulomb | |||||
| more ▼ | |||||
| x Potential difference | Volt | Volt |
In the physics of electrical circuits, the term potential difference or p.d. is sometimes used as an old-fashioned synonym for the modern quantity known as "the voltage (difference) between two positions in an electrical circuit". Following the...
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| x Capacitance |
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Farad | Farad |
In electromagnetism and electronics, capacitance is the ability of a body to hold an electrical charge. Capacitance is also a measure of the amount of electric charge stored (or separated) for a given electric potential. A common form of charge...
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| x Electrical resistance |
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Ohm | Ohm |
The electrical resistance of an object is a measure of its opposition to the passage of a steady electric current. An object of uniform cross section will have a resistance proportional to its length and inversely proportional to its cross-sectional...
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| x Electrical conductance | Siemens | Siemens |
Electrical conductance is a measure of how easily electricity flows along a certain path through an electrical element. The SI derived unit of conductance is the siemens (also called the mho, because it is the reciprocal of electrical resistance,...
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| x Magnetic flux |
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Weber | Weber |
Magnetic flux, represented by the Greek letter Φ (phi), is a measure of quantity of magnetism, taking into account the strength and the extent of a magnetic field. The SI unit of magnetic flux is the weber (in derived units: volt-seconds), and the...
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| x Magnetic flux density | Tesla | Tesla | |||
| x Inductance |
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Henry | Henry |
Inductance is the property in an electrical circuit where a change in the electric current through that circuit induces an electromotive force (EMF) that opposes the change in current (See Induced EMF).
In electrical circuits, any electric current i...
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| x Luminous flux |
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Lumen | Lumen |
In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying sensitivity of the...
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| x Illuminance |
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Lux | Lux |
In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of the intensity of the incident light, wavelength-weighted by the luminosity function to correlate with human brightness perception....
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| x Radioactive decay | Becquerel | Becquerel |
Radioactive decay is the process in which an unstable atomic nucleus spontaneously loses energy by emitting ionizing particles and radiation. This decay, or loss of energy, results in an atom of one type, called the parent nuclide transforming to an...
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| x Absorbed dose | Gray | Rad |
Absorbed dose (also known as total ionizing dose, TID) is a measure of the energy deposited in a medium by ionizing radiation. It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg, which is given the special name...
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| Gray | |||||
| x Equivalent dose | Sievert | Sievert |
The equivalent dose (HT) is a measure of the radiation dose to tissue where an attempt has been made to allow for the different relative biological effects of different types of ionizing radiation. Equivalent dose is therefore a less fundamental...
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| x Catalysis |
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Katal | Katal |
Catalysis is the process in which the rate of a chemical reaction is either increased or decreased by means of a chemical substance known as a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by...
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| Enzyme unit | |||||
| x Viscosity |
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Pascal second | Pascal second |
Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or extensional stress. In everyday terms (and for fluids only), viscosity is "thickness." Thus, water is "thin," having a lower viscosity, while honey...
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| x Torque |
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Newton metre | Ounce-force inch | De Prony brake |
Torque, also called moment or moment of force (see the terminology below), is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist.
In more basic...
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| Kilogram meter | |||||
| Inch-pound | |||||
| Foot-pound force | |||||
| Newton metre | |||||
| x Surface tension |
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Newton per metre | Newton per metre |
Surface tension is a property of the surface of a liquid. It is what causes the surface portion of liquid to be attracted to another surface, such as that of another portion of liquid (as in connecting bits of water or as in a drop of mercury that...
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| x Angular acceleration | Radian per second squared | Radian per second squared |
Angular acceleration is the rate of change of angular velocity over time. In SI units, it is measured in radians per second squared (rad/s), and is usually denoted by the Greek letter alpha (α).
The angular acceleration can be defined as either:...
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| x Irradiance | Watt per square metre | Watt per square metre |
Irradiance, radiant emittance, and radiant exitance are radiometry terms for the power per unit area of electromagnetic radiation at a surface. "Irradiance" is used when the electromagnetic radiation is incident on the surface. "Radiant exitance" or...
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| x Heat capacity |
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Joule per kelvin | Joule per kelvin |
Heat capacity (usually denoted by a capital C, often with subscripts) is a measurable physical quantity that characterizes the ability of a body to store heat as it changes in temperature. It is defined as the rate of change of temperature as heat...
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| x Specific heat capacity |
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Joule per kilogram per kelvin | Joule per kilogram per kelvin |
Specific heat capacity, often shortened to specific heat, is the measure of the heat energy required to increase the temperature of a unit quantity of a substance by unit degree. The term originated primarily through the work of 18th-century...
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| Joule per gram per kelvin | |||||
| x Specific energy | Joule per kilogram | Joule per kilogram |
Specific energy is defined as the energy per unit mass. Common metric units are J/kg or, in basic SI units: m/s. It is an intensive property. Contrast this with energy, which is an extensive property. There are two main types of specific energy:...
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| Joule per gram | |||||
| x Thermal conductivity |
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Watt per meter per kelvin | Watt per meter per kelvin |
In physics, thermal conductivity, k, is the property of a material that indicates its ability to conduct heat. It appears primarily in Fourier's Law for heat conduction.
Generally speaking, there are a number of possibilities to measure thermal...
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| x Energy density |
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Joule per cubic metre | Joule per cubic metre |
Energy density is a term used for the amount of energy stored in a given system or region of space per unit volume, or per unit mass, depending on the context. The latter is more formally known as specific energy. In some cases it is obvious from...
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| x Electric field strength | Volt per metre | Volt per metre | |||
| Newtons per coulomb | |||||
| x Electric charge density | Coulomb per cubic metre | Coulomb per cubic metre | |||
| x Electric flux density | Coulomb per square metre | Coulomb per square metre | |||
| x Permittivity | Farad per metre | Farad per metre |
Permittivity is a physical quantity that describes how an electric field affects, and is affected by, a dielectric medium, and is determined by the ability of a material to polarize in response to the field, and thereby reduce the total electric...
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| x Permeability | Henry per metre | Henry per metre |
In electromagnetism, permeability is the degree of magnetization of a material that responds linearly to an applied magnetic field. Magnetic permeability is typically represented by the Greek letter μ. The term was coined in September, 1885 by...
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| x Molar energy | Joule per mole | Joule per mole | |||
| Kilojoule per mole | |||||
| x Molar heat capacity | Joule per mole per kelvin | Joule per mole per kelvin | |||
| x Ionizing radiation exposure | Coulomb per kilogram | Coulomb per kilogram | |||
| x Absorbed dose rate | Gray per second | Gray per second | |||
| x Radiant intensity | Watt per steradian | Watt per steradian |
In radiometry, radiant intensity is a measure of the intensity of electromagnetic radiation. It is defined as power per unit solid angle. The SI unit of radiant intensity is watts per steradian (W·sr). Radiant intensity is distinct from irradiance...
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| x Radiance | Watt per square metre per steradian | Watt per square metre per steradian |
Radiance and spectral radiance are radiometric measures that describe the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction. They are used to characterize both...
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