Sound pressure

Sound measurements
Sound measurements
Characteristic	Symbols
Sound pressure	p, SPL, LPA
Particle velocity	v, SVL
Particle displacement	δ
Sound intensity	I, SIL
Sound power	P, SWL, LWA
Sound energy	W
Sound energy density	w
Sound exposure	E, SEL
Acoustic impedance	Z
Audio frequency	AF
Transmission loss	TL
	v; t; e;

Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa).^[1]

^ "Sound Pressure is the force of sound on a surface area perpendicular to the direction of the sound". Retrieved 22 April 2015.

[engineering_toolbox-1] "Sound Pressure is the force of sound on a surface area perpendicular to the direction of the sound". Retrieved 22 April 2015.

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