
%0 Journal Article
%A Deshpande, DD 
%A Bhatgadde, LG 
%T Heat capacities at constant volume, free volumes, and rotational freedom in some liquids
%J Australian Journal of Chemistry
%D 1971/09/01
%V 24
%N 9
%P 1817-1822
%K 
%R https://doi.org/10.1071/CH9711817
%U https://www.publish.csiro.au/paper/CH9711817 
%X This paper presents the experimental results on the velocity of sound, densities, and heat capacities of eight organic liquids at 25°, 35°, and 45°C. Using Eyring's equation, the free volumes have been calculated from the sound velocity data. For pure liquids, a quantity Cv* = (Cv)L- (Cv)g- Cstr called the residual heat capacity is found to be linearly dependent on free volume. Analysis of the data for 34 liquids shows that a plot of residual heat capacity against the free volume gives a series of straight lines differing in slopes for different groups of liquids such as hydrocarbons, halogen-substituted hydrocarbons, alcohols, etc. This behaviour is ascribed as being due to different degrees of rotational freedom of molecules in these liquids. 
