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Science > Acoustics 
decay time
Science; Acoustics
The time taken for the sound pressure level to fall by 60 dB - a million to one.
time weighting
Science; Acoustics
The time-averaging characteristic used to measure oscillatory or fluctuating quantities. Common time weightings are rectangular (perfect integration with no memory) and ...
noise immission level
Science; Acoustics
The total quantity of sound impinging on the ear over a long period, expressed in decibels. It can be calculated from LEX, ref. duration and the number of years of exposure.
hertz (Hz)
Science; Acoustics
The unit of frequency or pitch of a sound. One hertz equals one cycle per second. 1 kHz = 1000 Hz, 2 kHz = 2000 Hz etc.,
Newton meter (N·m)
Science; Acoustics
The unit of torque. Also used to measure energy or work in which case the SI unit is the joule J 1 N·m = 1 J = 1 W·s
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