Release 0.5.0 / 20 October 2026
The variation of the specific heat ratio and the speed of sound in air with temperature, pressure, humidity, and CO2 concentration
Environmental sound-speed model. The design tool requires temperature, relative humidity, local pressure and CO2 and rejects inputs outside its declared range; calculation precision is not instrument accuracy.
Source and scope
Owen Cramer (1993). The variation of the specific heat ratio and the speed of sound in air with temperature, pressure, humidity, and CO2 concentration. Journal of the Acoustical Society of America 93, 2510–2516.
Environmental sound-speed model. The design tool requires temperature, relative humidity, local pressure and CO2 and rejects inputs outside its declared range; calculation precision is not instrument accuracy.
Use in this release
Measured benchmark and protocol status. Citation does not imply endorsement, partnership or independent review.