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Coefficient of thermal expansion. The coefficient of thermal expansion describes how the size of an object changes with a change in temperature. Specifically, it measures the fractional change in size per degree change in temperature at a constant pressure. Several types of coefficients have been developed: volumetric, area, and linear.
The knowledge of heat capacity and its temperature dependence is very important for description of the thermodynamic properties of substances. In absence of experimental data group-additivity method is used for the estimation of heat capacity and other properties of the organic compounds.f the value is calculated the uncertainties of estimated heat capacities by formula (6) increase. If take into account the uncertainties of the room temperature heat capacity given in [1], the whole possible standard deviation can be estimated 3-5% and maximum deviation - 7-10%.