# Category:Definitions/Kilogram

This category contains definitions related to Kilogram.

The kilogram is the SI base unit of mass.

It is defined as being equal to:

The fixed numerical value of the Planck constant $h$ to be $6 \cdotp 62607015 \times 10^{-34}$ when expressed in the unit Joule seconds.

The Joule second is equal to $1 \, \mathrm {kg} \, \mathrm m^2 \, \mathrm s^{−1}$, where the metre and the second are defined in terms of:

the speed of light $c$
the time of transition between the two hyperfine levels of the ground state of the caesium $133$ atom at rest at $0 \, \mathrm K$.
 $\ds$  $\ds 1$ kilogram $\ds$ $=$ $\ds 1000$ grams $\ds$ $\approx$ $\ds 2.205$ pounds (avoirdupois)

## Pages in category "Definitions/Kilogram"

The following 6 pages are in this category, out of 6 total.