Question

What do you understand by Capillarity ? Write
down the formula for the rise of water in a
capillary tube.

Answer 1

Answer:

W = ρ (πD²/4) h g --(1)

The surface on the top liquid inside the capillary tube has a trough (cup) like shape. Assume the angle of contact with the walls be . Surface tension is the contact force per unit length along the circumference of top surface. This force pulls the liquid vertically upwards.

Answer 2

The definition of Capillarity is the formula for the rise of water in a capillary tube as follows:

• Capillary is a phenomenon in which liquid spontaneously rises or falls in a narrow space like a thin tube or porous material.
• The formula of the capillary tube is given by T=r(h+r3)ρg2cosθ.
• However, the capillary radius can be neglected h=2Tcosθrρg and thus it is known as the Ascent formula.
• The capillary is also a physical process in which liquids flow without gravity.
• Moreover, Surface tension is an important factor in the phenomenon of the capillary tubes.
• Some of the applications of the capillary tube are the supply of water to the leaves at the top of even a tall tree.

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