Kilogram
metric unit of mass / From Wikipedia, the free encyclopedia
The kilogram[lower-alpha 2] is the base unit of mass in the International System of Units (SI). It is widely used in science, engineering, and commerce worldwide. The kilogram is exactly the mass of one litre of water.
Quick Facts General information, Unit system ...
Kilogram | |
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General information | |
Unit system | SI base unit |
Unit of | mass |
Symbol | kg |
Conversions | |
1 kg in ... | ... is equal to ... |
Avoirdupois | ≈ 2.205 pounds[lower-alpha 1] |
British Gravitational | ≈ 0.0685 slugs |
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As of May 20, 2019, the definition of the kilogram is based on the Planck constant as 6.62607015×10−34 kg⋅m2⋅s−1.[1][2]
There are attempts to define the kilogram in other ways. One example specifies a number of atoms of a certain substance (at a certain temperature).
One kilogram is a little more than 2.2 pounds. One tonne is one thousand kilograms. One litre of water weighs almost exactly one kilogram, at 3.98 °C (39.16 °F; 277.13 K), at sea level. This was the basis of the definition of the gram in 1795.