# J : Sound and Vibration Definitions, Terms, Units, Measurements ..

**Jerk** a vector quantity that specifies time rate of change of acceleration - units m/s^{3}

**Joule : J** the derived SI unit of
Work or
Energy.

### A Joule is the work done by a Force of 1 Newton acting through a distance of one metre.

Joule = N·m = Kg·m^{2}/s^{2} = W·s = Pa·m^{3} = 10^{7} ergs = C·V

where kg is the

kilogram, m is the

metre, s is the

second, N is the

newton, Pa is the

pascal, W is the

watt, C is the

coulomb, and V is the

volt.

**joule per cubic metre : J/m**^{3} : see Energy Density

**joule per kilogram : J/kg** : see Specific Energy

**joule per second, J/s** :
see Sound Power