Enthalpy changes physical significance

The slope of a plot of the log of the retention time versus the inverse of the temperature is proportional to the enthalpy of retention for the probe molecule on the coal. This is a thermodynamic measure of the strength of the interaction between the probe molecule and the coal. The temperatures at which major changes in slope are observed represent the points where the mechanism of retention has changed, indicating that a significant change in the chemical or physical structure of the coal has occurred. 

None of these implementations can be used to study effects due to variar tion of the finite nucleus model, due to their limitation to a single finite nucleus model. Of course, it is unlikely that such variations lead to significant changes in the chemical behaviour of atoms and molecules, e.g., reaction enthalpies, valence electronic charge density distribution etc. However, the finer details of the electron distribution in the vicinity of heavy atomic nuclei will be more sensitive to the variation of the finite nucleus model, but this is clearly a field in the area of atomic and nuclear physics. 

JVo is a key parameter which significantly affects the physical properties of AOT reversed micelles. In the case of an AOT/oil solution, discontinuity of several physical properties of the solubilized water is observed at IVg 10 [16]. Below IV 10, the water is bound to the AOT polar head-groups and counterions, and further addition of water leads to the appearance of free water in the core of the water pools. However, the state of the water in the AOT reversed micelles, especially below Wg 2, appears unusual. We found that the solution enthalpy of the water in AOT/various organic solvents solutions indicated a great change in the state of the solubilized water [17,18]. 

---