The element argon along with mercury is present in fluorescent light.
Define a machine element.
An essential part of a machine is referred to as hardware or a machine element. Although coverings aren't typically thought of as machine element, they are an essential component of a machine that serve as a sartorial and functional contact between the mechanical parts of a machine and its users.
In addition to being discrete parts in and of themselves, machine elements can also be features of a part (like screw threads or integral plain bearings) or features of a part (like wheels, axles, pulleys, rolling-element bearings, or gears). All simple machines can be thought of as machine element, and many of these machine elements contain ideas from one or more simple machines. A lead screw, for instance, has a screw thread that is an inclined plane wound around a cylinder.
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