Question

Calculate the magnitude of capillary effect in millimeters (the height) in a glass tube of 7mm diameter, when immersed in mercury. The temperature of the liquid is 25°C and the values of surface tension of mercury at 25°C is 0.51 N/m. The angle of contact for mercury is 30° (mercury density is 13.7 gram per cubic centimeter, g=10 meter per second squared​

Answer 1

Given:

σ = 0.51N/m

ρ  = 13.7

g = 10m

θ = 30°

d = 7mm = 0.007m

To Find:

the magnitude of capillary effect in millimeters.

Solution:

h  = $\frac{4 \times cos\theta \times \sigma}{\rho\times g\times d}$

   =  $\frac{4\times cos30\times 0.51}{13.7\times 10\times0.007}$

   =   0.328 mm