explain briefly the changes in states of matter .
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The change in state of matter of a substance from solid to liquid or from liquid to gas is brought imparting heat energy to it at a constant temperature .
(a) The process of change of a substance from solid state into its liquid state on absorption of heat at a particular temperature , called the melting point , is called melting or fusion i.e.,
Solid
Melting
Heat absorbed
Liquid
(b) The process of change of a substance from a liquid state to its gaseous state at a particular temperature , called the boiling point , is called boiling or vaporisation , i.e.,
Liquid
Boiling
Heat absorbed
Gas
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