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Clausius-Clapeyron Vapor Pressure Calculator

ln(P2/P1) = −ΔHvap/R·(1/T2−1/T1) — vapor pressure vs temperature.

Calculates the vapor pressure of a liquid at a new temperature using the Clausius-Clapeyron equation from a known vapor pressure and enthalpy of vaporization.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

ln(P2/P1) = (ΔHvap/R) × (1/T1 − 1/T2)

In depth

Calculates the vapor pressure of a liquid at a new temperature using the Clausius-Clapeyron equation from a known vapor pressure and enthalpy of vaporization.