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Vapor Pressure of Water Calculator
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Vapor pressure is the minimum amount of pressure that must be applied to a liquid's surface to prevent it from evaporating. In other words it is an indication of a liquids evaporation rate.

Vapor pressure of water (P) = 10A−[B/(C+T)]  

Where
  • P - Vapor Pressure of Water
  • T - Water Temperature, in Celsius
  • A,B,C - Antoine Constants for Water. When water temperature in the range of 1-100 Celsius A=8.07131, B=1730.63, C=233.426; when the temperature in the range of 99-374 degree Celsius, A=8.14019, B=1810.94 and C=244.485.

 

Steps for Vapor Pressure of Water Calculator

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Step 1 :  

Read the problem and observe the value of water temperature given.



Step 2 :  

Substitute the value of temperature in the formula.


 P =10A−[B/(C+T)]



Problems on Vapor Pressure of Water Calculator

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  1. Calculate the vapor pressure of water at 70oF.


    Step 1 :  

    The temperature of water is given as 70oF. Convert it into centigrade.


    70oF = 21.1oC



    Step 2 :  

    Substitute the value in the formula to obtain the vapor pressure of water.


    P = 10A−[B/(C+T)]


    P = 108.07131 - [1730.63/(233.426+21.1)]


    P = 18.701 mmHg



    Answer  :  

    The vapor pressure of water is P = 18.701 mmHg.



  2. Calculate the vapor pressure of water at 65oF.


    Step 1 :  

    The temperature of water is given as 65oF. Convert it into centigrade.


    65oF = 18.3oC



    Step 2 :  

    Substitute the value in the formula to obtain the vapor pressure of water.

    P = 10A−[B/(C+T)]

    P = 108.07131 - [1730.63/(233.426+18.3)] 


    P = 15.712 mmHg



    Answer  :  

    The vapor pressure of water is P = 15.712 mmHg



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