Question

explain role of latent heat in the change of a substance

Answer 1

Latent heat is the heat energy per mass unit required for a phase change to occur. If we think aboutsubstances at a molecular level, gaseous molecules have more vibration than liquid molecules. So when you add heat to a liquid, you are actually causing the molecules to vibrate.



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Answer 2

1)During change of state of a substance, object absorbs or rejects heat energy.
2) But the temperature does not change.
3) The heat energy is utilized for weakening the bonds between the atoms or molecules in the substance.
4) Hence, this energy which causes a change in state and does not change the temperature is called Latent heat.