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Boiling points and melting points are temperatures at which change of phase occurs to liquids and
solids. Some substances, such as water, have a TRIPLE POINT temperature at which all three phases (solid, liquid, vapor), exist simultaneously.

Boiling point of a liquid is the temperature at which its phase changes into vapor and the melting point of a solid is the temperature at which it changes state from solid to liquid. The solid and liquid phase of a substance exist in equilibrium at the melting point. The reverse change from liquid to solid is referred to as the freezing point. The freezing point of a substance is often determined by observing the temperature at which a solid begins to change into a liquid, which is actually the melting point, because a characteristic property of some substances is their ability to supercool.

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