Dependence of intrinsic properties on process variables

Every intrinsic quantity can be made dimensionless by dividing it by its value in the reference state. The reduced quantity obtained in this way can be expressed as a dimensionless function of a reduced temperature. 

The temperature dependence of non-activated processes differs from that of activated processes. In the latter the temperature dependence is in essence determined by an activation energy that determines the probability of the process. 

A maybe a volume, a specific heat, etc. B is an expansion property B/,4R usually is nearly constant. As an example, the molar volume in the glassy state was expressed (Chap. 4) as  

The ratio ac JR has the dimension of a temperature. Sometimes it is related to characteristic temperatures that play a part in the process. We have, for instance, seen that in the shift factor of relaxation processes (Chap. 13) the following correlation is valid  

Many reduced intrinsic quantities are correlated with a reduced time quantity usually the expression can be written in the following form  

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