This equation can be derived by noting that the Gibbs free energy in two phases must be equal and rearranging terms to obtain the derivative of pressure with respect to temperature as equal to latent heat divided by the product of temperature and volume differential.
An analogue of this expression for superconductors can be used to relate the difference in entropy per unit volume to the product of the magnetic field and the derivative of the field with respect to temperature. This equation can be derived by noting that the Gibbs free energy in two phases must be equal and rearranging terms to obtain the derivative of pressure with respect to temperature as equal to latent heat divided by the product of temperature and volume differential. For 10 points, identify this doubly-eponymous equation from thermodynamics that is useful in drawing the coexistence curves between simultaneous phases.
An analogue of this expression for superconductors can be used to relate the difference in entropy per unit volume to the product of the magnetic field and the derivative of the field with respect to temperature.
Clausius-Clapeyron equation