Question

Capillary W contains water and capillary M contains mercury. The contact angles between the capillary wall and the edge of the meniscus at the air-liquid interface in $W$ and $M$ are $\theta_W$ and $\theta_M$, respectively. The contact angles satisfy the conditions

• A. $\theta_W$ > 90° and $\theta_M$ > 90°
• B. $\theta_W$ > 90° and $\theta_M$ < 90°
• C. $\theta_W$ < 90° and $\theta_M$ > 90°
• D. $\theta_W$ < 90° and $\theta_M$ < 90°

Answer 1

Answer: (C)

$\theta_W$ < 90° and $\theta_M$ > 90°

Answer 2

The correct option is (C): $\theta_W$ < 90° and $\theta_M$ > 90°