Speed of Sound Calculator

Notes:

1] Program to calculate the velocity of sound for a temperature range of 0 to 30 degrees C, and relative humidity 0 to 100 % RH, at standard atmospheric pressure and typical CO₂ concentration

2] The algorithm is based on the approximate formula published in JASA [1993] by Owen Cramer, "The variation of the specific heat ratio and the speed of sound in air with temperature, pressure, humidity, and CO₂ concentration."

3] Cramer's formula gives 331.45 m/s for dry air at STP; calculations made without double precision may be closer to 331.46 m/s

4] The original formula also enables speed and gamma calculations for varying CO₂ and pressure

5] Reference: J. Acoust. Soc. Am. 93(5) p2510-2616; formula at p2514

6] No guarantee of any kind whatsoever for this software

First Released April 1997
Rev 2 - May 1997

HomePage