kilogram metre squared per second
SI coherent derived unit
|kilogram metre squared per second||kg m2 s−1||angular momentum|
The kilogram metre squared per second, symbol kg m2 s−1, is the SI coherent derived unit of angular momentum.
The kilogram metre squared per second, is equivalent to the units newton metre second, symbol N m s, and joule second, symbol J s.
The kilogram is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10−34 when expressed in the unit J s, which is equal to kg m2 s−1, where the metre and the second are defined in terms of c and ΔνCs.
The effect of this definition is that the unit kilogram metre squared per second, symbol kg m2 s−1, can be defined directly in terms of the Planck constant h. Thus:
Angular momentum is the rotational equivalent of linear momentum. It is a conserved quantity – the total angular momentum of a closed system is constant.