Do we always need to supply heat or change the pressure for charging the state of matter?
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You need some energy. Heat is probably the easiest energy you can use to change your physical state. The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point.
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The state of matter can be changed by changing temperature or pressure. ... Latent heat of vaporisation is the heat energy required to change kg of a liquid to gas at atmospheric pressure at its boiling point
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