Question

The contact angle between pure water and pure silver is 90°. If a capillary tube made of silver is dipped at one end in pure water, will the water rise in the capillary?

Answer 1

No, the water will neither rise nor fall in the silver capillary.

\[\text{ According to Jurin's law, the level of water inside a capillary tube is given by }\]
\[h = \frac{2Tcos\theta}{r\rho g}\]
\[\text{ Here }, \theta = {90}^0 \]
\[ \Rightarrow h = \frac{2Tcos {90}^0}{r\rho g} \]
\[ \Rightarrow h = 0\]

Thus, the water level neither rises nor falls.