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.

Heat Capacity Ratio

A finite measured or assumed value greater than or equal to 0.

Temperature Kelvin

A finite measured or assumed value greater than or equal to 0, expressed in K.

Molar Mass Kg Per Mol

A finite measured or assumed value greater than or equal to 0, expressed in kg/mol.

The implemented rule is: Ideal-gas sound speed sqrt(gamma*R*T/M) from heat-capacity ratio, Kelvin temperature and molar mass.^[1]

Speed Meters Per Second

The calculated speed 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.

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.

• Speed Of Sound Air Temperature

  Approximate dry-air sound speed in m/s from Celsius temperature using 331.3+0.606T; intended for ordinary ambient conditions.

• Bulk Modulus From Sound Speed

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

• Cents To Ratio Converter

  Frequency ratio corresponding to a signed interval in cents.