The speed of sound in an ideal gas, under adiabatic conditions, is a function of temperature and is given by:  
where C is the speed of sound, γ, known as the adiabatic index, is the ratio of specific heats at constant pressure and constant volume (Cp/Cv), R is the gas constant, and T is the absolute temperature.
In addition to temperature, which is the dominant factor, infrasound propagation is affected by the local wind velocity. Therefore we can combine the temperature and wind effect in the effective sound speed, written as  
where C...

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