Based on sound speeds in gaseous and liquid air measured by Younglove and Frederick [Int. J. Thermophys. 13(6), 1033–1041 (1992)], empirical equations for the computation of sound speeds in the above media at relatively smaller temperature and pressure ranges were derived. For gaseous air, over a temperature range from 200 to 300 K and pressure from 0.614 to 10.292 MPa, the maximum deviation between the measured sound speeds and those computed with the empirical equation is 56 ppm. For liquid air, over the ranges from 90 to 110 K for temperature and from 0.763 to 13.823 MPa for pressure, the corresponding deviation is 173 ppm.

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