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Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps. It is also used in the flint (actually ferrocerium) of lighters.
Why does water fill the bottom of the glass rather than cling to the sides? Attractive forces hold the water molecules together as a liquid and gravity holds the water molecules at the bottom of the glass. Why do beads of water often form on a slippery surface, such as a freshly waxed car?