A material is hydrophobic when it repels water (hydrophobia = fear of water) and tends to be comprised of non-polar molecules. Since water (H2O) is a polar solvent, it does not readily interact with non-polar molecules. The beading of the colored water on the hydrophobic surface is the result of the hydrophobic effect that causes the water to minimize its contact surface area by forming spheres.
A super hydrophobic material like the one shown here forms droplets that have a contact angle greater than 160° and readily slide off the surface.
Source: https://youtu.be/i3jA40arq9Y (The Slow Mo Guys)
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