Doc: Liquefaction of Gases Class 11 Notes | EduRev

Chemistry for JEE

Class 11 : Doc: Liquefaction of Gases Class 11 Notes | EduRev

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7. Critical phenomenon & Liquefaction of gases:

The phenomena of converting a gas into liquid is known as liquefaction. The liquefaction of gas is achieved by controlling P and T as follows:

1. Increasing pressure: An increase in pressure results in an increase in attraction among molecules.

2. Decreasing temperature: A decrease in temperature results in decrease in kinetic energy of molecules.

Critical temperature (Tc) : It is defined as the characteristic temperature for a given gas below which a continuous increase in pressure will bring liquefaction of gas and above which no liquefaction is noticed although pressure may be increased e.g. Tc for CO2 is 31.2°C.

TCDoc: Liquefaction of Gases Class 11 Notes | EduRev

Critical pressure (Pc) : It is defined as the minimum pressure applied on 1 mole of gas placed at critical temperature, to just liquefy the gas

PC = Doc: Liquefaction of Gases Class 11 Notes | EduRev

Critical Volume (Vc) : The volume occupied by 1 mole of gas placed at critical conditions.

VC = 3b (i.e. P = Pc and T = Tc)


8. Collision parameters 

- Mean free path

Doc: Liquefaction of Gases Class 11 Notes | EduRev = Doc: Liquefaction of Gases Class 11 Notes | EduRevDoc: Liquefaction of Gases Class 11 Notes | EduRev (Doc: Liquefaction of Gases Class 11 Notes | EduRev = coefficient of viscosity)

Doc: Liquefaction of Gases Class 11 Notes | EduRev = Doc: Liquefaction of Gases Class 11 Notes | EduRev

k = Boltzman constant ; Doc: Liquefaction of Gases Class 11 Notes | EduRev = collision diameter.

- Collision frequency (z) : no. of collision taking place per second per unit volume.

- Collision diameter : Closest distance between the centre of two molecule which are participating in collision.

-  Relative Humidity (RH) : 

At a given temperature

RH = Doc: Liquefaction of Gases Class 11 Notes | EduRev

-  Loschmidth Number 

The number of molecules present in 1 cc of gas (or) vapour at STP.

value : 2.617 × 1019 1 cc

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