What factors affect the vapor pressure of a liquid?

1 Answer
Dr. Hayek
Jan 4, 2016

#ln(P_(vap))=-(DeltaH_(vap))/R(1/T)+C#

Explanation:

The expression of vapour pressure is given by:

#ln(P_(vap))=-(DeltaH_(vap))/R(1/T)+C#

where, #DeltaH_(vap)# is the enthalpy of vaporization and it is a constant for a specific liquid.

#R# is the universal gas constant: #R=8.3145 J/(mol.K)#.

#T# is the temperature and #C# is a constant.

Therefore, looking at the aforementioned expression, the only variable that affects the vapour pressure is temperature .

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