Heat And Thermodynamics

The equation of state of a real gas is given by \(\left(\mathrm{P}+\frac{\mathrm{a}}{\mathrm{V}^2}\right)(\mathrm{V}-\mathrm{b})=\mathrm{RT}\), where \(\mathrm{P}, \mathrm{V}\) and \(\mathrm{T}\) are pressure, volume and temperature respectively and \(\mathrm{R}\) is the universal gas constant. The dimensions of \(\frac{\mathrm{a}}{\mathrm{b}^2}\) is similar to that of :