Question

A liquid can change into vapour state-

1. At a fixed temperature

2. At all temperature

Name the process involved in two cases.(Also give two major differences between the process mentioned above.)

Answer 1

When water meets dry air, it is not in equilibrium; water molecules evaporate off the surface until the amount of water in the air creates enough vapour pressure to achieve equilibrium. When water is heated to a temperature of 100°C, the water turns into steam, escaping into air.

During evaporation, water is not turning into a gas or steam, but random movement of molecules on the surface of water provides some of the molecules enough energy to escape from the surface into the air. Evaporation takes place only on the surface of the body of water.
this is how liquid molecule become gasious and it occures in all temperature

But boiling point of a liquid will happen only in a fixed temperature and for water it is 100 degree celcius


so if we are naming the process
1.boiling
2.evaporation
​​