 Jurin's law

For a circular capillary of inner radius $r$, balance the vertical force $2\pi r\gamma \cos \theta$ against the hydrostatic column weight $\rho g\pi r^{2}h$. The displayed signed height follows, neglecting meniscus-volume corrections. A wetting liquid with $\theta <\pi /2$ rises, whereas a nonwetting liquid with $\theta >\pi /2$ is depressed. The contact angle is measured through the liquid. The expression uses radius rather than diameter and presumes equilibrium at the specified wall chemistry.