In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.

Q: Sentence: Condensation of the following could occur as a result of decreasing the heat energy of a gas. Question: Which of the following could occur as a result of decreasing the heat energy of a gas?

A: condensation
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Q: Sentence: Solid property are alkali metals at room temperature. Question: What property are alkali metals at room temperature?

A: solid
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Q: Sentence: Expansion of a gas into a vacuum is irreversible because the external pressure is measurably less than the internal pressure of the gas, and no states of equilibrium exist. Question: Expansion of a gas into a vacuum is irreversible because the external pressure is measurably less than the internal pressure of the gas, and no states of what exist?

A:
equilibrium
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