1.

Explainwhy(a) Theangle of contact of mercury with glass is obtuse, while that of waterwith glass is acute.(b) Wateron a clean glass surface tends to spread out while mercury on thesame surface tends to form drops. (Put differently, water wets glasswhile mercury does not.)(c) Surfacetension of a liquid is independent of the area of the surface(d) Waterwith detergent dissolved in it should have small angles of contact.(e) Adrop of liquid under no external forces is always spherical in shape

Answer»

Explain
why



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



(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.)


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


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


(e) A
drop of liquid under no external forces is always spherical in shape



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