Density (ฯ) and ultrasonic velocity (u) values of glycine in 1.0 M aqueous KCl and 1.0 M aqueous NaCl solutions have been measured as a function of amino acids concentration at T = (298.15, 303.15, 308.15, 313.15, 318.15 and 323.15) K. Using the ฯ and u data, the thermodynamic parameters such as partial molal volume (ฯ 0 v ), isentropic compressibility (ฮบ s ), change in isentropic compressibility (ฮฮบ s ), relative change (ฮฮบ s /ฮบ 0 ) in isentropic compressibility and partial molal isentropic compressibility (ฯ 0 k ), values have been computed. The increase in partial molal volume with temperature is attributed to the volume expansion of hydrated zwitterions. The ฯ 0 v and ฯ 0 k values of glycine in 1.0 M aqueous KCl and NaCl solutions are larger than the corresponding values in water. The larger partial molal volumes of glycine in 1.0 M aqueous KCl and NaCl is ascribed to the formation of 'zwitterion-K + /Na + /Cl -' and 'K + /Na + /Cl --water dipole' aggregates in solutions. The variation of ฮบ s, ฮฮบ s and ฮฮบ s /ฮบ 0 with amino acid/zwitterions concentration and temperature is discussed in terms of zwitterions-ions, zwitterions-water dipoles, ion-ion, ion-water dipoles due to intermolecular/interionic interactions occurring in the systems.