Question

Define latest heat of vapouration.

Answer 1

Hey, here is the answer...

The amount of heat energy required to change liquid state into gaseous state with respect to atmospheric pressure, at the boiling point of substance is called latent heat of vapouration..

hope this will help.

Answer 2

Hi friend,

As when the ice melts, the temperature doesn't change and remains same. Same in the case when we boil water, when we boil water the temperature doesn't change even if it is continuosly heated, {the temperature remains same till the whole water is changed to vapours}, this happens because when we heat the liquid, the heat we supplies is used in increasing kinetic energy of the molecules. And once the liquid starts boiling the heat is used in breaking forces of attraction between the molecules. And the liquid changes to liquid.

So, Energy absorber by the molecules to change water to vapours at its boiling point is known as latent heat of vapourisation.

Latent heat of vapourisation is the amount of heat required to convert one unit mass of a liquid substance into vapour at its boiling point without change in temperature.

SI unit of latent heat of vapourisation is JOULE PER KILOGRAM [ J/kg ].


Hope it helps...!!!!