Clausius-Clapeyron relation

The Clausius-Clapeyron relation is named after Rudolf Julius Emanuel Clausius and Benoît Paul Émile Clapeyron. Upon a phase equilibrium curve

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \frac{dp}{dT} = \frac{\Delta \left( \frac{S}{N}\right)}{\Delta \left( \frac{V}{N}\right)} = \frac{\Delta S}{\Delta V}}

where p is the pressure, T is the temperature, S is the entropy and V is the volume.