We have all played in the rain and we have all at one point or other in our lives watched a rain droplet slowly move down a window pane but have any of you wondered why a rain drop is in fact spherical in shape? Why isn’t it square or triangular in shape? The reason is due to surface tension. The cohesive forces between liquid molecules are responsible for the surface tension. The molecules of water on the surface don't have like molecules around it. So the molecules lying in the surface are attracted or pulled downward by the adjacent water molecules. So the water droplets tend to be pulled into shape of spherical due to cohesive forces. If other forces including gravity are missing, then droplets of all the fluids have spherical shape. So this spherical form is easier to form, required less surface tension, less wall tension. More the surface tension more will be the spherical form.


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