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Explain why:
(d) Water with detergent dissolved in it should have small angles of contact.

Water with detergent dissolved in it has small angles of contact (θ). This is because for a small θ, there is a fast capillary rise of the detergent in the cloth. The capillary rise of a liquid is directly proportional to the cosine of the angle of contact (θ). If θ is small, then cosθ will be large and the rise of the detergent water in the cloth will be fast.

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Explain why:
(b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km.

Explain why

(a) The angle of contact of mercury with glass is obtuse, while that of water with glass is acute.

Explain why?
(b) Water on a clean glass surface tends to spread out while mercury on the same surface tends to form drops. (Put differently, water wets glass while mercury does not.)

Expalin why?
(c) Surface tension of a liquid is independent of the area of the surface

Mechanical Properties of Fluids

Explain why:(d) Water with detergent dissolved in it should have small angles of contact.

Explain why:
(d) Water with detergent dissolved in it should have small angles of contact.