For air at sea level the speed of sound is given by. If the temperature is T C 20 C T 293 K the speed of sound is v 343 ms. The speed of sound is the distance traveled per unit time by a sound wave propagating through an elastic medium.
Air is almost an Ideal Gas.
Now since speed is defined to be the distance per time the speed of a sound wave has to be the wavelength of the wave divided by the period of the wave. C g x R x T M c the speed of sound in an ideal gas R the molar gas constant set at approximately 83135 J g Adiabatic index 14 for air T absolute temperature M the gas molar mass dry air is 00289645 kgmol When you are calculating the speed of sound in air you can simplify the formula to. 667 kn or a kilometre in 29 s or a mile in 47 sIt depends strongly on temperature as well as the medium through which a sound wave is propagating. V 331 ms 06 msCT v 331 ms 06 msC20 C v 331 ms 12 ms.