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A drop of liquid under no external force...

A drop of liquid under no external forces is always spherical in shape.

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Any system tends to remain in a state of minimum . In the absence of any external force for a given volume of liquid its surface area and consequently surface energy is least for a spherical shape . It is due to this reason that a liquid drop in the absence of an external force is spherical in shape.
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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION - B Numerical From Textual Exercise
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