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.

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.