Vapor Pressure Calculator

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Antoine: vapor pressure at a single temperature using tabulated constants. Clausius-Clapeyron: VP at a new temperature given VP at a reference temperature and enthalpy of vaporization. Raoult: VP of an ideal solution.
Select a substance to auto-fill the NIST Antoine constants, or choose Custom to enter your own.
Temperature in degrees Celsius. Must be within the valid range for the selected substance.
degC
Vapor pressureModerate volatility
23.6864

Equilibrium vapor pressure of the substance or solution

Pressure unitmmHg
Vapor pressure (mmHg)23.686mmHg
Vapor pressure (kPa)3.1579kPa
Vapor pressure (atm)0.031166atm
Normal boiling point estimate100degC
Volatility classModerate volatility
3.1579 kPa
Low volatility<2Moderate2-25High volatility25-100Very high100+

Vapor pressure: 23.6864 mmHg

  • The vapor pressure (0.0312 atm) is below 1 atm, so the liquid would not boil at this temperature under standard atmospheric pressure.
  • The estimated normal boiling point (where vapor pressure = 760 mmHg) is 100.0 degC based on the Antoine equation.
  • At 25 degC the substance is classified as moderate volatility (reference vapor pressure ~3.16 kPa).

Next stepAntoine constants are empirical and valid only within their listed temperature range. For precision work, verify constants against the NIST Chemistry WebBook.

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