Have you ever wondered, what happens when a drop of water fell into the water tank. When a droplet of water strike, then quite often a layer of air that is trapped beneath the drop is possible to prevent the direct combination of the droplet of water. As the air layer is removed, the surface tension “pulls” of the mass of the drop in water and thus formed a new smaller droplet. And this in turn bounces off the surface, repeating the above procedure until the surface tension fully absorb the droplet.
[youtube]http://www.youtube.com/watch?v=XtlgI34y3Wc&feature=player_embedded[/youtube]
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