Question

while boiling water a student observed that temperature remains constant at 100c till whole of water vapourises. explain

Answer 1

The temperature remains constant during the boiling of water even though heat is supplied continuously. This is because,the heat supplied is absorbed by the water particles and this heat increases their kinetic energy. Thus, because of an increase in kinetic energy, the bond between the water particles are cut down and they move more freely, compared to water. Hence, they become gas. So, this is why the temperature remains constant even though heat is supplied continuously to the water.

Answer 2

Explanation:

while boiling the water the temperature remains constant at 100 c till whole of water vaporize because that heat is gets used up in changing the liquid state to vapour state by overcoming the force of attraction between the particles of water.