Condition when pressure on liquid > vapour pressure - Fluid Mechanics

Q.  When is a liquid said to be not in a boiling or vaporized state?
- Published on 05 Aug 15

a. If the pressure on liquid is equal to its vapour pressure
b. If the pressure on liquid is less than its vapour pressure
c. If the pressure on liquid is more than its vapour pressure
d. Unpredictable

ANSWER: If the pressure on liquid is more than its vapour pressure

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    Discussion

  • Niraja   -Posted on 25 Sep 15
    All the liquids have a tendency to escape the molecules from its free surface called evaporation or vaporisation. When this vaporising liquid is placed in a closed vessel, the vapour molecules get accumulated in the space between free surface and top of the vessel. This accumulated vapour of the liquid exerts partial pressure on the liquid surface called as vapour pressure. If the pressure on liquid is less than or equal to vapour pressure, the liquid starts boiling or vaporize.

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