Question

With increase in temperature, the fluid level in capillary tube will

• A. increase.
• B. decrease.
• C. remain constant.
• D. first decrease then increase.

Answer 1

The correct option is B decrease.

$h=4\times \cos \theta \times \frac{\sigma }{\rho gd}$
As temperature increases, surface tension ($\sigma$) decreases. Therefore, corresponding level of fluid will decrease as well.