Advertisements
Advertisements
Question
No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapours?
Advertisements
Solution
Due to the weak intermolecular force of attraction, the molecules of a liquid move freely inside it. In the process, they collide with each other transferring energy between them. Molecules with higher kinetic energy reach the surface of the liquid. These molecules absorb some more heat from the surroundings to gain sufficient kinetic energy to overcome the force of attraction on them due to other molecules inside the liquid escaping from the surface into space. These escaping molecules form the vapour of the liquid. Thus, evaporation of the liquid happens even though no heat is supplied to it.
APPEARS IN
RELATED QUESTIONS
Evaporation takes place only from the surface of liquid.
All molecules of a liquid take part in boiling.
Boiling is a rapid phenomenon.
Evaporation takes place at ................. .
Heat is ................... during boiling.
In evaporation
During boiling or vaporization
Give reason for the increase in rate of evaporation of a liquid when air is blown above the liquid.
What is the change in average kinetic energy of molecules of a liquid during boiling at its boiling point?
How is the heat energy supplied to a liquid used during boiling at a fixed temperature?
