At low pressure,Vander Waal's equation is reduced to $\left[ P + \frac{a}{V^2} \right]V = RT$. The compressibility factor $(Z)$ can be given as
- A$1 - \frac{a}{RTV}$
- B$1 - \frac{RTV}{a}$
- C$1 + \frac{a}{RTV}$
- D$1 + \frac{RTV}{a}$
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