# Formula Speed of Sound in a Gas Temperature

## Speed of sound

Unit
The speed of sound in a gas (e.g. air) depends on the air temperature T [°C]. The speed of sound also depends on the propagation medium.
Medium at 20 °CSpeed of sound $$c_{\text s}$$ in $$\mathrm{m}/\mathrm{s}$$
Gas: Air344
Gas: Helium981
Liquid: Benzene1326
Liquid: Water1484
Solid: Plexiglass2670
Solid: Iron5170
Speed of sound in different media.

## Temperature

Unit
Temperature of the gas (e.g. air) in degrees Celsius. The formula is considered a good approximation for temperatures between -20 °C and 40 °C.