Heating a liquid causes an increase to the speed and

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of its particles. Eventually, the temperature increases to the
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and the particles separate, becoming a
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. Cooling a liquid is the opposite process. Eventually, the temperature reaches the
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and the particles stay in fixed positions as a
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.

Answer 1

Heating a liquid causes an increase to the speed and energy of its particles. Eventually, the temperature increases to the boiling point and the particles separate, becoming a gas. Cooling a liquid is the opposite process. Eventually, the temperature reaches the freezing point and the particles stay in fixed positions as a solid.