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In page Phase transition:

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First-order phase transitions are those that involve a latent heat. During such a transition, a system either absorbs or releases a fixed (and typically large) amount of energy per volume. During this process, the temperature of the system will stay constant as heat is added: the system is in a "mixed-phase regime" in which some parts of the system have completed the transition and others have not.[2][3] Familiar examples are the melting of ice or the boiling of water.[citation needed] (Water does not instantly turn into vapor, but forms a turbulent mixture of liquid water and vapor bubbles.[citation needed])