Mercury is a chemical element with the symbol 80. It is commonly known as quicksilver and was formerly named hydrargyrum (/haɪˈdrɑːrdʒərəm/ , silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure ; the only other element that is liquid under these conditions is the halogen bromine, and rubidium.
Mercury occurs in deposits throughout the world mostly as cinnabar (mercuric sulfide is obtained by grinding natural cinnabar or synthetic mercuric sulfide.
Mercury is used in thermometers , manometers , float valves, mercury relays and other devices, though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor of alternatives such as alcohol -filled glass thermometers and thermistor - or infrared -based electronic instruments. Likewise, mechanical pressure gauges and electronic strain gauge sensors have replaced mercury sphygmomanometers.
Mercury remains in use in scientific research applications and in amalgam in some locales. It is also used in fluorescent lighting. Electricity passed through mercury vapor in a fluorescent lamp produces short-wave ultraviolet light , which then causes the phosphor in the tube to fluoresce , making visible light.
Mercury poisoning can result from exposure to water-soluble forms of mercury (such as mercuric chloride or methylmercury), by inhalation of mercury vapor, or by ingesting any form of mercury.