Question

How can gases be liquefied?​

Answer 1

In general, gases can be liquefied by one of three general methods: 1) By compressing the gas at temperatures less than its critical temperature; In this approach, the application of pressure alone is sufficient to cause a gas to change to a liquid. For example, ammonia has a critical temperature of 271°F (133°C).

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Answer 2

L.P.G. which is used for cooking. In the cylinder petrol is in liquid form. When it is lighted it becomes gas.