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Two different gases .A. and .B. are fill...

Two different gases .A. and .B. are filled in separate containers of equal capacity under tha same conditions of temperature and pressure. On increasing the pressure slightly the gas .A. liquefies but gas B does not liquefy even on applying high pressure until it is cooled. Explain this phenomenon.

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The temp. at which a gas cannot be liquefied howsoever high pressure may be applied on the gas is called critical temperature. Thus, gas A. liquefies easily, this suggests gas .A. is below its critical temperature.
On the other hand, gas .B. does not liquefy easily even on applying high pressure. This suggests that gas .B. is above its critical temperature.
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