Clapeyron equation

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Clapeyron equation Equation that relates the temperature (T) at which a mineralogical phase change occurs, with associated change in volume (ΔV), to the pressure. ΔHdT/dp = TΔV, where the thermal gradient as a function of pressure is dT/dp (usually assumed to be adiabatic within the Earth) and ΔH is the heat of fusion.