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Strutt|Fundamentals|Speed of Sound calculates the wave velocity of sound in air as a function of temperature using the following ideal-gas equation:

`c_(ideal) = sqrt((gamma R T )/ M)`

`gamma` = 1.4 is the adiabatic index
`R` = 8.3145 is the ideal gas constant
`M` = 0.029 is the molar mass of dry air
`T` is the air temperature (in Kelvin)

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