Temperature dependence of heat capacity and viscosity of non-associated liquids

Abstract

The temperature dependence of the viscosity of some non-associated liquids is compared with the variation with temperature of the heat capacity C_V at constant volume. Those liquids which show Arrhenius viscosity behaviour throughout the liquid range have no structural contribution to C_V. Those liquids which show non-Arrhenius viscosity behaviour at low temperature have a structural C_V in the non-Arrhenius region only. Both the non-Arrhenius viscosity and the structural heat capacity arise from the restriction of molecular rotation in liquids.