Water Vapor Pressure Boiling Point Equations Formulas Calculator

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Antoine Equation.

Solve for temperature.

Notes:

This calculator uses a fitted equation to calculate the saturated vapor pressure. Therefore, the calculated values should be considered approximate. The equation is has a valid range of 1°C to 374°C and 4.89 mmHg to 162991 mmHg.
The constants for the Antoine formula are located below. This calculator uses the first set of constants for temperatures below 100° Celsius. The equation requires temperature to be in Celsius and pressure in mmHg. This calculator automatically makes the conversion.
Water will boil when the atmospheric pressure is less than the vapor pressure for a given temperature.

Inputs:

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Conversions:

water vapor pressure

= 0

millimeter of mercury

Solution:

temperature

= NOT CALCULATED

Other Units:

Constants Table

Water Temperature Range	A	B	C
1°C ≤ T ≤ 100°C	8.07131	1730.63	233.426
99°C ≤ T ≤ 374°C	8.14019	1810.94	244.485

Change Equation
Select to solve for a different unknown

Antoine Equation

	Solve for saturated vapor pressure.
	Solve for temperature.
	Internet application to solve for the vapor pressure of water. This includes a line graph of temperature versus pressure.

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Water Vapor Pressure and Boiling Point Equations Formulas Calculator

Inputs:

Conversions:

Solution:

Other Units: