Decimetre

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  Hectometre

  A hectometre (American spelling: hectometer, symbol hm) is a somewhat uncommonly used unit of length in the metric system, equal to one hundred metres. It derives from the Greek word "ekato", meaning "hundred".
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  Picometre

  A picometre (symbol pm) is a unit of length in the metric system, equal to one trillionth, i.e. (/1,000,000,000,000) of a meter, which is the current SI base unit of length. It can be written in scientific notation as 1×10 m (scientific notation) or 1 E−12 m (engineering notation) — both meaning 1...
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  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 written as 10 × 10 m (engineering notation) or 1E−2...

• Megametre

  A megametre (American spelling: megameter, symbol Mm) is a unit of length in the metric system, equal to one million metres, the SI base unit of length, hence to 1,000 km or approximately 621.37 miles. Megametres (from the Greek words megas = big and metro = count/measure) are rarely seen in...

• 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 conventionally used measurement unit for expressing...

• Decametre

  A decametre also dekametre (American spelling: dekameter, earlier decameter symbol dam) is a very rarely used unit of length in the metric system, equal to ten metres, the SI base unit of length. It can be written in scientific notation as 1 E+1 m (exponential notation) — meaning 10 × 1 m. This...