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InterviewSolution
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30. The water droplets in free fall are spherical due to |
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Answer» Every molecule of liquid draws its neighboring molecules towards it, and is itself also drawn towards every neighboring molecule. Only the molecules which are on the surface are not drawn externally. Beyond the surface there are no further molecules, hence obviously there is no question of being pulled by other molecules in the outward direction. Result: Every molecule on the surface faces equal pull inward. It is as if the common center in the liquid is exerting equal pull on each of the molecules and drawing them towards it. Thus, liquid naturally takes spherical shape and a droplet is formed. Surface tension is responsible for theshapeof liquiddroplets. Although easily deformed,dropletsofwatertend to be pulled into aspherical shapeby the cohesive forces of the surface layer. In the absence of other forces, including gravity,dropsof virtually all liquids would be approximatelyspherical. |
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