Acoustic Glossary


 

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


J (joule) the derived SI unit for workenergysound energy.

Equivalents : N·m = Kg·m2/s2 = W·s = Pa·m3 = 107 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/kg (joule per kilogram) • see specific energy

J/m3 (joule per metre-cubed)energy densitysound energy density

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

Equivalent : W/m2

J/s (joule per second) = W (watt)

Jerk a vector quantity that specifies time rate of change of acceleration - units m/s3

Joule and related SI units

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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