Based on nitrogen sound speeds measured by Younglove and McCarty in 1980 [J. Chem. Thermodynam.12, 1121–1128 (1980)], a multicolumn coefficient fitting method is used to derive an empirical equation for the computation of sound speed at temperatures from 150 to 330 K and pressures from 0.028 75 to 1.506 85 MPa. The maximum deviation between the measured sound speeds and those computed with the empirical equation is less than 380 ppm.