Question

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Define surface tension. Obtain an expression for excess pressure inside a liquid bubble.
What happens to the surface tension of a liquid when temperature is increased?
Carries 5 Marks

Class 11 CBSE

Answer 1

Answer:

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HERE IS YOUR ANSWER

1surface tension the molecules on the surface film experience the net force in inward direction normal to the surface. ... Due to excess of pressure inside the liquid drop, the free surface of the drop will experience the net force in outward direction due to which the drop expands.

Temperature

surface tension decreases when temperature increases because cohesive forces decrease with an increase of molecular thermal activity. The influence of the surrounding environment is due to the adhesive action liquid molecules have at the interface.

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Answer 2

It has no component perpendicular to the horizontal surface. As a result, there is no pressure difference between the liquid side and the vapour side. ... Thus, there is always an excess of pressure on the concave side of a curved liquid surface over the pressure on its convex side due to surface tension.