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Clapeyron relation
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Clapeyron relation

physics
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Quick Summary

The Clapeyron equation relates changes in phase for a pure substance. It describes the rate at which the pressure changes with temperature at equilibrium between two phases. This rate is determined by the heat of transition and the volumes of the phases before and after the transition.1

The equation is particularly useful for understanding phase changes like vaporization. For example, it can be used to determine how the boiling point of water changes with pressure. The Clapeyron equation can be applied to melting, sublimation, and vapor-pressure curves, with the slope of these curves related to the latent heat and volume change during the phase transition.23

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3 Britannica Sources
  1. Clapeyron equation
  2. thermodynamics - The Clausius-Clapeyron equation
  3. liquid - Representative values of phase-diagram parameters

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