Physics > mechanics > Units And Measurements

$\left(P + \frac{a}{V^2}\right)(V - b) = RT$ represents the equation of state of some gases. Where $P$ is the pressure, $V$ is the volume, $T$ is the temperature and $a$, $b$, $R$ are the constants. The physical quantity, which has dimensional formula as that of $\frac{b^2}{a}$, will be: