characteristic impedance of a medium surface density of mechanical impedance
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pascal second per metre
Pa· s/m
Pa x s/m
C67
Acoustics
acoustic impedance
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pascal second per cubic metre
Pa·s/m³
Pa x s/m³
C66
Acoustics
loudness level
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phon A unit of subjective sound loudness. A sound has loudness p phons if it seems to the listener to be equal in loudness to the sound of a pure tone of frequency 1 kilohertz and strength p decibels.
