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CBSE Class 11-science Answered

explain vapour pressure
Asked by shuchi.saumya | 05 Oct, 2010, 12:00: AM
answered-by-expert Expert Answer
Dear student
The pressure exerted by a vapor in equilibrium with its solid or liquid phase is called vapour pressure.

Suppose we have a closed container into which we pour some water. As soon as we add the water we check a pressure gauge connected to the container. We let the container sit for a while and then we check the pressure again.

As the water evaporates the pressure exerted by the vapor above the liquid increases, until at some point, the pressure reaches a constant value which is called the vapor pressure of the substance

Vapor pressure increases with temperature

  • At higher temperature more molecules have the necessary kinetic energy to escape the attractive forces of the liquid phase
  • The more molecules in the vapor phase, the higher the vapor pressure
 The temperature at which vapour pressure becomes equal to atmospheric pressure is called boiling point
thanks
Topper's team
Answered by | 05 Oct, 2010, 01:14: PM

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