Vapor Pressure from Antoine Calculator

Antoine Equation

The relation is log₁₀(P) = A - B / (C + T) where T is in °C and P is computed in mmHg and then converted to other units.

Substance preset Presets use coefficients for mmHg and °C. Verify against your dataset before critical use.

Temperature

Unit

Decimals

Enable temperature sweep (table)

Start temperature

End temperature

Step

Sweep uses the same unit you selected above. Results are reported in °C and multiple pressure units.

FAQs

The coefficients assume pressure in mmHg and temperature in °C. Using another basis requires different coefficients or conversions to keep the equation consistent.

The Antoine equation is empirical and accurate only over limited temperature spans. Many fluids have segmented ranges with different A B C values for low and high temperatures.

Enter temperature in °C K or °F. The tool converts to °C internally before applying the equation so coefficient consistency is maintained.

Results include mmHg kPa bar atm and Pa using standard conversions. mmHg is the native unit from the equation then other units are derived.

A warning appears because accuracy may degrade. Consider using an alternative segment of coefficients or a different correlation such as Wagner or extended Antoine fits.

Yes. Enable the temperature sweep and specify start end and step. You will get a scrollable table and a CSV download for external analysis or plotting.

They are convenient for learning and quick checks. For critical design or safety decisions validate coefficients and ranges against authoritative property data sources.

Antoine Equation

FAQs

What units do the Antoine coefficients use here?

Why do some substances need multiple coefficient sets?

How do I convert temperature for the calculation?

Which pressure units are reported?

What if my temperature is outside the preset range?

Can I generate a table across temperatures?

Are the built‑in coefficients sufficient for design?

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