Heat capacities of the water + lithium bromide + ethanolamine (LiBr/H 2 N(CH 2 ) 2 OH mass ratio ) 3.5) and water + lithium bromide + 1,3-propanediol (LiBr/HO(CH 2 ) 3 OH mass ratio ) 3.5) systems were measured by using an isoperibol solution calorimeter at four temperatures (283.15, 298.15, 313.15, and 333.15 K) and absorbent (LiBr + H 2 N(CH 2 ) 2 OH and LiBr + HO(CH 2 ) 3 OH) concentration ranges of (29.2 to 70.7)% and (30.7 to 68.3)%, respectively. The measured values were fitted with a simple equation by a least-squares method and the average absolute deviations between experimental and calculated values were 0.21% for the water + lithium bromide + ethanolamine system and 0.15% for the water + lithium bromide + 1,3-propanediol system, respectively.
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