Prigogine-Defay ratio

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The Prigogine-Defay ratio[1] is given by (Eq. 1 of [2]):

\Pi = \frac{1}{VT} \left. \frac{\Delta C_p \Delta k}{ (\Delta \alpha)^2} \right|_{T=T_g}

where V is the volume, T is the temperature, T_g is the temperature of the glass transition, C_p is the isobaric heat capacity, k is the compressibility and \alpha is the thermal expansion coefficient.


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