All thermodynamic quantities may be derived from the grand partition function and we will consider all thermodynamic quantities to be functions of only the three variables " z ", ? ( or " T " ), and " V ".
22.
The benefit of using statistical mechanics is that it provides exact methods to connect thermodynamic quantities ( such as heat capacity ) to microscopic behaviour, whereas, in classical thermodynamics, the only available option would be to just measure and tabulate such quantities for various materials.
23.
And thus also ?S?= ( ?H??G?) / T . As important the four quantities ?H? ?G? ?S?and K d may be, particularly for drug design, it is important to emphasize that they are typical thermodynamic quantities that do not say anything about the kinetics of the reaction.
24.
It is very difficult to measure the absolute amount of any thermodynamic quantity involving the internal energy ( e . g . enthalpy ), since the internal energy of a substance can take many forms, each of which has its own typical temperature at which it begins to become important in thermodynamic reactions.
25.
The work of Adams, et al . ( 1979 ) showed that the reaction field produces results with thermodynamic quantities ( volume, pressure and temperature ) which are in good agreement with other methods, although pressure was slightly higher with the reaction field method compared to the Ewald-Kornfeld method ( 1.69 vs 1.52 ).
26.
Despite the prevailing negative view on the measurability of single ion coefficients, the concept of single ion activities continues to be discussed in the literature, and at least one author presents a definition of single ion activity in terms of purely thermodynamic quantities and proposes a method of measuring single ion activity coefficients based on purely thermodynamic processes.
