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Definition, become from a solid to a liquid by heating.

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How does it occur?

3
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When the internal energy of the solid increases.

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Definition, the process of turning liquid into gas.

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How does it occur?

6
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On the surface of a liquid before reaching boiling point.

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Expansion

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Definition

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The action in gas is the state of becoming larger or more extensive.

10
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How does it occur?

11
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Because of a chemical reaction, the gas will occupy almost all space possible.

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Bye