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Gas is in its state for either or both of two reasons, both leading to the same effect. Either the temperature of the substance is too great to remain at a liquid state, or there is insufficient pressure to keep the molecules together enough to remain a liquid. Both reasons will cause the molecules to spread out, eventually turning into a gas. For a gas to turn into a liquid, either the pressure the substance is under would have to be increased or the temperature decreased, causing the molecules to be pressed together enough to return to its liquid form.

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14y ago

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