CBSE Class 11-science - Surface Tension and Capillarity Videos

• What is capillarity? Give some applications of capillarity.
• Determine the height of purple liquid in a U tube. Density of purple liquid is 0.7 g/cc , density of blue liquid = 1.4 g/cc , density of mercury = 13.6 g/cc.
• What is the radius of new bubble formed if two bubbles of radii 2 cm and 1.5 cm coalesce?
• Consider a bubble of radius 1.5 cm on which surface tension is 3.9 x 10^-2 Nm^-1. Calculate the pressure inside it.
• Suppose there are two bubbles B₁ and B₂. The excess pressure inside B₁ is twice the excess pressure in B₂. Find the ratio between the volumes of the two bubbles.
• Draw the graph of the excess pressure inside a soap bubble when it is blown slowly.
• Dirty or greasy stains cannot be cleared by washing with water and we need detergents. Why?
• Why is ploughing of fields essential?
• State the factors on which the angle of contact depends.
• <div>How do trees draw water form the ground?</div>

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