Hinge is a joint. It is designed to join two 'arms' together while letting them move freely. A lever is when a pivot, load, effort is present. Although hinge itself is not a lever, but taking our biceps as an example, that would be a Class 3 lever.
Physical properties. Tungsten is a hard brittle solid whose color ranges from steel-gray to nearly white. Its melting point is the highest of any metal, 3,410Â°C (6,170Â°F) and its boiling point is about 5,900Â°C (10,600Â°F). Its density is about 19.3 grams per cubic centimeter. Tungsten conducts electrical current very well.
Description: Named from the Swedish word meaning heavy stone, tungsten is a gray-white metal that is stable and unaffected by air, acids or bases. It has the highest melting point of any element and often is used in alloys that must resist great amounts of heat, such as light-bulb filaments. Tungsten also is used in television tubes, paints, high-temperature lubricants, tanning leather and fluorescent lighting.