Question

Determination of Critical Constants​

Answer 1

Answer:

The critical temperature, Tc, is characteristic of every gas and may be defined as: “The temperature below which the continuous increase of pressure on a gas ultimately brings about liquefaction and above which no liquefaction can take place no matter what so ever pressure be applied”.

Answer 2

Answer:

The three critical constants are critical temperature, critical pressure and critical volume. 

Critical Temperature ($T_{c}$) :

• Critical temperature of a gas may be defined as that temperature above which  the gas cannot be liquefied however high the pressure may be applied. 

Critical Pressure ($P_{c}$) :

• At critical temperature, a certain pressure is needed to liquefy the gas. So, this pressure at critical temperature is called the critical pressure.

Critical Volume ($V_{c}$) :  

• The volume occupied by one mole of a gas at its critical temperature and critical pressure is known as the critical volume.