## 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

### Judged Perceived Noise Level Definition IEC 801-29-10,

sound pressure level, in decibels, of a frontally presented octave band of pink noise centred on 1 kHz and lasting for two seconds, that is subjectively judged equally noisy as a given sound

See also perceived noise level

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