When matter absorb heat the intermolecular forces in between the particles decreased. Making them having a high kinetic energy. The particles would be far apart from each other after a several stage of absorbing heat. That is why matter would change its physical state from solid to liquid and liquid to solid.
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Explanation:
When matter absorb heat the intermolecular forces in between the particles decreased. Making them having a high kinetic energy. The particles would be far apart from each other after a several stage of absorbing heat. That is why matter would change its physical state from solid to liquid and liquid to solid.