# Limitations of Van der waal’s equation

**Limitations of Van der waal’s equation**

(i) The value of ‘b’ is not constant but varies with pressure and temperature.

(ii) The value of is not equal to 3b, but actually it is equal to, in some case; and in other cases 2b.

(iii) The value of is not equal to but it is ususlly more than 3 for most of the gases.

**Inversion Temperature:**

** **It is the temperature above which a gas warms up in adiabatic expansion of a gas from high pressure to low pressure. It is denoted by and is related with van der Waals constants as:

**Boyle’s Temperature:**

The temperature at which a real gas obeys Boyle’s law is known as Boyle’s temperature . It is related with van der Waals constants as:

*Units of van der Waals constants*

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