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Vapor Pressure of Water Calculator

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The vapor pressure of water calculator will help to calculate the vapor pressure of water at a given temperature. Vapor pressure of water is the pressure exerted by the water at a given temperature. The formula to calculate the vapor pressure of water is given as,

Vapor pressure of water, P = 10$^{Z-[B/(C+T)]}$
where,
T = temperature of water in Celsius,
A, B and C = Antoine constants for water.

Antoine Constants for water :

Temperature of water  A   B   C 
 1$^{\circ}$ C - 100$^{\circ}$ C  8.07131   1730.63   233.426 
 99$^{\circ}$ C - 374$^{\circ}$ C  8.14019  1810.9  244.485

Plugin the temperature of the water into the vapor pressure of water calculator to get the result.
 

Steps

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Steps to calculate the vapor pressure of water :

Step 1 : Note the temperature of the water from the problem.

Step 2 : Plugin the value from the Antoine constant table into the formula given to get the vapor pressure of water.
P = 10$^{Z-[B/(C+T)]}$

Problems

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Here are some of the problems given based on vapor pressure of water.

Solved Examples

Question 1: At 30$^{\circ}$ C, calculate the vapor pressure of water.
Solution:
Given temperature, T = 30$^{\circ}$ C

For 30$^{\circ}$ C,
A = 8.07131, B = 1730.63 and C = 233.426

The vapor pressure of water at 30$^{\circ}$ C is,

P = 10$^{A-[B/(C+T)]}$

P = 10$^{8.07131 - [1730.63 /(233.426 + 30)]}$

P = 31.7401 mmHg

The vapor pressure of water at 30$^{\circ}$ C is 31.7401 mmHg.


Question 2: At 270$^{\circ}$ C, calculate the vapor pressure of water.
Solution:
Given temperature, T = 270$^{\circ}$ C

For 270$^{\circ}$ C,
A = 8.14019, B = 1810.9 and C = 244.485

The vapor pressure of water at 270$^{\circ}$ C is,

P = 10$^{A-[B/(C+T)]}$

P = 10$^{8.14019 - [1810.9 /(244.485 + 270)]}$

P = 41714 mmHg

The vapor pressure of water at 270$^{\circ}$ C is 41714 mmHg.