Question

During the change of state,temperature does not rise or fall.What happens to the heat energy supplied or given out?Explain

Answer 1

Hi friend,

When we provide heat to any object (solid, liquids), we see that there is no rise in temperature even if u provide heat continuously. Why?

=> Suppose we are providing heat to ice to melt it and the temperature does not rise because the heat energy is used in breaking forces of attraction between particles of ice(solid) to convert it into liquid, so when we provided ice heat, the kinetic energy increased and the forces of attraction of solids broke and the molecules started to move faster and hence converted to liquid. Same is with liquid, when we provide heat to liquid to make vapours, the heat energy is used to break down the left out forces of attraction and hence the liquid vapourises and convert to vapours.

And this heat is known as LATENT HEAT OF FUSION(when we are converting solids to liquids) and LATENT HEAT OF VAPOURISATION ( when we convert liquid to gas). Latent heat means hidden heat in thermometer as this heat is hidden by temperature, the thermometer is not showing any rise to temperature even we are providing heat.

Hope it helps...

Answer 2

it turns out to be latent heat which means hidden heat stored while conversion of states takes place.so more kinetic energy requires in liquid than solid or gas than liquid and solid.