Question

Define critical temperature

Answer 1

Critical Temperature

Gases can be converted to liquids by compressing the gas at a suitable temperature.

Gases become more difficult to liquefy as the temperature increases because the kinetic energies of the particles that make up the gas also increase.





Microscopic view of a gas.

Microscopic view of a liquid.

The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied.

Every substance has a critical temperature. Some examples are shown below.

substance

critical temperature (oC)

NH3

132

O2

-119

CO2

31.2

H2O

374



Tubes containing water at several temperatures. Note that at or above 374oC (the critical temperature for water), only water vapor exists in the tube.

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Answer 2

Heya friends
the temperature of a gas in its critical state, above which it cannot be liquefied by pressure alone is called critical temperature.
hope this will help you :-))