First slide

Surface tension and surface energy

Question

A pin or a needle floats on the surface of water, the reason for this is

Easy

A

Surface tension
B

Less weight
C

Upthrust of liquid
D

None of the above

Solution

The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle’s weight

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