Sound Pressure

Overview

Engineering reference data for Sound Pressure in acoustics.

Key Formulas

Speed of Sound

$c = \sqrt{\gamma R T}$

Speed of sound in an ideal gas.

Sound Level

$L = 10 \log_{10}(I/I_0)$

Decibel level.

Wavelength

$\lambda = c / f$

Wavelength = speed / frequency.

Variables

Symbol	Description	Unit
$c$	Speed of sound	m/s
$L$	Sound level	dB
$\lambda$	Wavelength	m
$f$	Frequency	Hz

Subjective Perception of Sound

The perception of sound loudness is not linearly proportional to the physical sound pressure level. Research indicates general trends in how humans subjectively perceive changes in sound intensity.

References

• Original Source