Speed of Sound

The speed of sound depends mainly on temperature.  Only in circumstances of high temperature, high humidity conditions does the composition of air become a factor.  The speed of sound shown below is calculated assuming dry air. 

The velocity of sound is important in ballistics because drag functions that govern the deceleration of the bullet are a function of the mach number.  Input a bullet velocity to calculate the mach number.

Speed of sound (fps) = sqrt(2403.2 * (Temp + 459.67) )

where I have grouped a number of constants into the value 2403.2

Mach Number = velocity / speed of sound

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