Unformatted text preview: The highest temperature at which a substance can exist as a liquid is called its critical temperature The critical pressure is the pressure required to bring about condensation at the critical temperature For example, oxygen has a critical temperature of 154.4 °K. It cannot be liquefied until the temperature is reduced to this point. At this temperature, the pressure needed to liquefy oxygen is 49.7 atm....
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- Fall '10