What is Bottle cap?
[[Image:WaterSportsBottlecaps.PNG|thumb|right|A plastic bottle cap on a water bottle]] [[Image:Knolle neutral.jpg|thumb|right|Beer bottle, with a Crown cork]] '''Bottle caps''' are used to seal the opening of [[bottle]]s. For [[glass]] bottles, these are usually small, specially adapted pieces of metal. With [[plastic]] bottles, plastic caps are used instead. The original bottle cap was called '''Crown cork'''. It is pressed onto the bottle, and can be removed, using a [[bottle opener]]. In recent years bottle caps with screw on mounts are used that way, a bottle opener is no longer required. Caps for plastic bottles are often made of a different type of plastic from the bottle. A cork is another type of closure for the top of a bottle. Bottle caps were invented in 1892 when young scientist Colt Williams wanted the water in his bottle to not spill. ==Other websites== {{commons category-inline|Bottle caps}} {{tech-stub}} [[Category:Tools]]