Question

How to we liquefy the gases

Answer 1

By increasing pressure and decreasing temperature..

Answer 2

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 agas to change to a liquid. For example, ammonia has a critical temperature of 271°F (133°C).
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