Question

define critical temperature and give formula​

Answer 1

Answer:

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.

Answer 2

Answer:

The critical temperature, pressure, and volume simply represent TC, PC, and VC respectively, and above which the gases can not be liquified. Therefore, the Critical temperature is the maximum temperature at which the gas can be liquefied and the temperature above which the liquid cannot exist.

From the critical constants like temperature, pressure, and volume formula of Van der Waals constants, b = VC/3 and a = 27 R2 TC2/64PC.