Question

what do you mean by critical tempratute
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Answer 1

Answer:

The critical temperature of a substance can be defined as the highest temperature at which the substance can exist as a liquid. At temperatures above the critical temperature, the substance in question (in its vapour/gaseous state) can no longer be liquified, regardless of the amount pressure applied to it.

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Answer 2

the temperature of a gas in its critical state, above which it cannot be liquefied by pressure alone