Values of the adiabatic and isothermal compressibility, kappa(S) and kappa(T), of some 80 molten salts at the corresponding temperature of T = 1.1T(m) (T-m is the melting point) are obtained from literature data either directly or re-calculated here. For some of the series of salts: alkali metal halides and nitrates, divalent metal halides, and alkali metal sulfates and carbonates the kappa(T) values are inversely proportional to the corresponding cohesive energy densities ced (internal energies per unit volume, separately for each class of compounds). The ced values for 1: 2 and 2: 1 salts not previously evaluated are presented here too. (C) 2013 Elsevier Ltd. All rights reserved.