Equivalents : N·m = Kg·m²/s² = W·s = Pa·m^{3} = 10^{7} ergs

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.

**J·s/m² (joule second per metre-squared)** the derived SI unit of flux density

Equivalent : W/m² = sound intensity

**Judged Perceived Noise Level** (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 aircraft noise • effective perceived noise level • maximum perceived noise level • noise and number index • noise exposure forecast • perceived noise level • T10 • tone-corrected perceived noise level