how do you liquify the gases?
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gases are condensed and compressed under great pressures then liquified
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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; 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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