sound pressure level
uses a logarithmic scale to express the magnitude of the root mean square sound pressure relative to the reference value.
symbols, variables and units
L_p: dB; p_rms,p₀: Pa; p₀ in air is usually 20 μPa.
applicable conditions and boundaries
Reference sound pressure, frequency weighting and integration time must be specified.
formula source code
The following is a copyable LaTeX expression.
L_p=20\log_{10}\frac{p_{rms}}{p_0}Reference and Extended Learning
OpenStax · University Physics Volume 1, Sound ↗is organized according to model definition and assumptions. Please check actual conditions and original literature before engineering, research and clinical use.
sound pressure leveldecibels