How does the Vapor Pressure Calculator work?

Input substance, temperature(s), enthalpy of vaporization Then: Calculate vapor pressure Then: Predict boiling point.

Can you give an example of how to use the Vapor Pressure Calculator?

Example: Input Water at 25°C: P = 23.8 mmHg gives a result of At 100°C: P = 760 mmHg (boiling point).

Is the Vapor Pressure Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Vapor Pressure Calculator?

Our Vapor Pressure Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Vapor Pressure Calculator

P₁ (Pa)

T₁ (K)

T₂ (K)

ΔHvap (J/mol)

Vapor pressure increases exponentially with temperature (Clausius-Clapeyron): ln(P₂/P₁) = -ΔH_vap/R × (1/T₂ - 1/T₁).

Difficulty:intermediate

References

›Vapor Pressure — Wikipedia

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