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What happens inside the matter during the change of state?

Sciences - Main Course Book
Chapter 1. Matter in our Surroundings


Kinetic energy of particles of matter increases
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When the temperature of the liquid reaches the boiling point,the additional heat energy is absorbed to overcome the intermolecular force of attraction and hence the intermolecular space decreases .
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If it changes from solid to liquid or liquid to gas or solid to gas then force of attraction between atoms decreases

If it changes from liquid to solid or gas to liquid or gas to solid then force of attraction increases
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