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Clausius-Clapeyron Vapor Pressure Calculator

Vapor pressure at T₂ from vapor pressure at T₁ and ΔHvap.

Compute the vapor pressure of a liquid at a new temperature T₂ from the known vapor pressure at T₁ and the heat of vaporisation ΔHvap, using the integrated Clausius-Clapeyron equation.

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

Inputs

kPa
K
K
kJ/mol

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/T₂ − 1/T₁)

In depth

Compute the vapor pressure of a liquid at a new temperature T₂ from the known vapor pressure at T₁ and the heat of vaporisation ΔHvap, using the integrated Clausius-Clapeyron equation.