In the present work we compare such thermodynamic functions as partial molar enthalpies and partial molar entropies of the reaction of the hydrogen desorption from the Ti0.9Zr0.1Mn1.2V0.1-H and Ti0.9Zr0.1Mn1.5V0.8-H systems, which were calculated on the base of data obtained from the study of these systems by means of P-C measurements and the calorimetric method at pressure up to 50 atm and the temperature range from 75 to 116 degrees C. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.