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in: Glossary, Units

Hour

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The hour (symbol: h) is a unit of time. It is not an SI unit but is accepted for use with the SI.

Definition[]

In modern usage, an hour is a unit of time 60 minutes, or 3,600 seconds in length. It is approximately 1/24 of a median Earth day.

See Wikipedia:hour for a fuller definition.

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Base units
Ampere · Candela · Kelvin · Kilogram · Metre · Mole · Second
SI base unit
Derived units
Becquerel · Coulomb · degree Celsius · Farad · Gray · Henry · Hertz · Joule · Katal · Lumen · Lux · Newton · Ohm · Pascal · Radian · Siemens · Sievert · Steradian · Tesla · Volt · Watt · Weber
Accepted for use
with SI
Dalton (Atomic mass unit) · Astronomical unit · Day · Decibel · Degree of arc · Electronvolt · Hectare · Hour · Litre · Minute · Minute of arc · Neper · Second of arc · Tonne
Atomic units · Natural units
See also
SI prefixes · Systems of measurement · Conversion of units · New SI definitions · History of the metric system
Wikipedia book Book:International System of Units  · Category Category:SI base units
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