Explain the phenomena due to surface tension, Physics

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(i) Lead balls are spherical in shape.

(ii) Rain leaves and a globule of mercury placed on glass plate are spherical.

(iii) Hair of shaving painting brush, when goes in water spread out, but as soon as it is taken out. Its fur sticks together.

(iv) A greased needle saved gently on the free surface of water in a beaker does not sink.

(v) Likewise, insects may go on the free area of water without drowning.

(vi)Bits of computer gum go irregularly when engaged on water surface.

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