When a drop of water falls, it is prevented from spreading smoothly across a surface by a microscopically thin layer of air that it can't push aside - so instead of wetting the surface, parts of the liquid fly off, and a splash is generated.Ī layer of air 1 micron in size – fifty times smaller than the width of a human hair – can obstruct a 1mm drop of water which is one thousand times larger. Dr James Sprittles from the Mathematics Institute has created a new theory to explain exactly what happens - in the tiny space between a drop of water and a surface - to cause a splash.
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