Use this calculation for a first-order acoustics estimate when the stated geometry, propagation model, averaging convention, reference quantity, and SI units match the measurement or design problem.

Temperature Celsius

A finite measured or assumed value, expressed in C.

The implemented rule is: Approximate dry-air sound speed in m/s from Celsius temperature using 331.3+0.606T; intended for ordinary ambient conditions.^[1]

Meters Per Second

The calculated meters per second, expressed in m/s.

This is an idealized calculation rather than a complete acoustic simulation or measurement. Reflections, boundary conditions, directivity, damping, frequency dependence, near-field behavior, background noise, transducer response, temperature, humidity, and geometry can change a real result. The linear dry-air approximation is intended for ordinary ambient temperatures and does not account for humidity, pressure composition, or wide temperature extremes.

Confirm important results with calibrated measurements or a model that includes the actual geometry, materials, boundaries, source directivity, and frequency-dependent losses. Preserve the reference quantity and weighting whenever a result is expressed in decibels.

• Gas Sound Speed Gamma Ratio

  Ideal-gas sound speed sqrt(gamma*R*T/M) from heat-capacity ratio, Kelvin temperature and molar mass.

• Bulk Modulus From Sound Speed

  Adiabatic bulk modulus rho*c² from medium density and sound speed.

• Air Absorption Loss

  Atmospheric attenuation in dB from a specified frequency-dependent attenuation coefficient and path distance.