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Why is vapour pressure independent on the volume of space above the liquid ? According to ideal gas law pressure inversely proportional to volume. Then why is it not applicable to vapour pressure.Can you pleases explain it to me.

Asked by sureshkalanjoor 28th May 2017, 8:51 PM
Answered by Expert
Answer:
Dear sureshkalanjoor@yahoo.co.in

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.

Vapor pressure depends on the composition of the liquid and the temperature. Vapor pressure neither depend on the total surface area of the liquid, nor on the volume of the liquid in the container, nor on the volume of container itself, just as long as some liquid remain when equilibrium is reached. The reason for these fractions not influencing is that none of the factors affects the rate of evaporation per unit surface area.
An example is water's vapor pressure, which happens to be relatively low because of the hydrogen bonding between the water molecules. No matter what volume the water is, the vapor pressure of the water is the same as long as the temperature is not change.


Regards

Topperlearning Team.
Answered by Expert 29th May 2017, 10:34 AM
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