By which of the following methods can a gas be liquified?
Method I: By increasing temperature and reducing pressure.
Method II: By reducing temperature and increasing pressure.
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In general, gases can be liquefied by one of three general methods: (1) by compressing the gas at temperatures less than its critical temperature; (2) by making the gas do some kind of work against an external force, causing thegas to lose energy and change to theliquid state; and (3) by making gas do work against ...
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