Capillary Action

🔶Capillarity Action🔶

●Capillarity is phenomenon by which a liquid rise or fall into a glass tube above or below it's liquid surface.
●The phenomenon is due to the combined effect of cohesion and adhesion of liquid particles.
●The curved free surface of a liquid in a capillary tube is called the Meniscus.

Dig.

♦️ Height of water in capillary tube (h) :- 4σcosθ/ρgd

♦️ Capillary action is due to both adhesion and cohesion.

♦️ For capillary action diameter of tube should not be less than 3cm

♦️ θ = 0° for water and glass

♦️ θ = 128° for mercury and glass

Where, θ is angle of contact between the liquid and the material.

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