Question: what is the dimension of velocity of sound

title: Speed of sound
text: The effect from impurities can be significant when making high - precision measurements . Chemical desiccants can be used to dry the air , but will in turn contaminate the sample . The air can be dried cryogenically , but this has the effect of removing the carbon dioxide as well ; therefore many high - precision measurements are performed with air free of carbon dioxide rather than with natural air . A 2002 review found that a 1963 measurement by Smith and Harlow using a cylindrical resonator gave `` the most probable value of the standard speed of sound to date . '' The experiment was done with air from which the carbon dioxide had been removed , but the result was then corrected for this effect so as to be applicable to real air . The experiments were done at 30 ° C but corrected for temperature in order to report them at 0 ° C. The result was 331.45 ± 0.01 m / s for dry air at STP , for frequencies from 93 Hz to 1,500 Hz .