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Cars & Vehicles
Scientific Method

Why does water bead up on a hood of a newly waxed car why does this not occur on a dirty car?


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May 10, 2010 11:00AM

Wax is hydrophobic, meaning it repels water. Of course, this repulsion is not strong enough to make the water hover a millimeter above the surface, but it is strong enough to force the water to act in this way, rather than sit there in a thin sheet. The "surface tension" of the water itself also plays a role.