Physics behind Water drops during falling from a tap

what is physics behind Water drops during falling from a tap. water drop animation

A drop or droplet is a small column of liquid, bounded completely or almost completely by free surfaces.

• Why Water drops falling into spheres (during falling from a tap in vacuum )?

please note that a drop of water made of $H_2O$ atoms. Drop of water

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@ modernton: Your question is probably related to my question physics.stackexchange.com/questions/33768/… –  Waffle's Crazy Peanut Aug 22 '12 at 14:03
I often wondered if allowed to drop at high speeds, would the spheres flatten out like pancakes, or elongate like teardrops. –  ja72 Aug 22 '12 at 14:12
This wiki page could be helpful. –  user10001 Aug 22 '12 at 14:17
Possible duplicate: physics.stackexchange.com/q/3841/2451 –  Qmechanic May 9 '13 at 12:42

Surface tension and gravity are at work here. The surface tension minimizes potential energy when water forms a sphere and gravity acting on each and every molecule of water makes it fall.

List of surface tension values for water in air.

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