Mercury is used primarily for the manufacture of industrial chemicals or for electrical and electronic applications by chemical man

Mercury is a chemical element with symbol Hg and atomic number 80. It is commonly known as Quicksilver and was formerly named hydrargyrum. A heavy, 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 bromine, though metals such as cesium, gallium, and rubidium melt just above room temperature.

Mercury occurs in deposits throughout the world mostly as cinnabar (mercuric sulfide). The red pigment vermilion is obtained by grinding natural cinnabar or synthetic mercuric sulfide.

Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps 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- or galinstan-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 for dental restoration in some locales. It is 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 a 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.
Mercury is used primarily for the manufacture of industrial chemicals or for electrical and electronic applications. It is used in some thermometers, especially ones which are used to measure high temperatures. A still increasing amount is used as gaseous mercury in fluorescent lamps, while most of the other applications are slowly phased out due to health and safety regulations and is in some applications replaced with less toxic but considerably more expensive Galinstan alloy.

Medicine
Amalgam filling
Mercury and its compounds have been used in medicine, although they are much less common today than they once were, now that the toxic effects of mercury and its compounds are more widely understood. The first edition of the Merck's Manual featured many mercuric compounds such as:

Mercurio
Mercuro-iodo-hemol.
Mercury-ammonium chloride
Mercury Benzoate
Mercuric
Mercury Bichloride (Corrosive Mercuric Chloride, U.S.P.)
Mercury Chloride
Mild Mercury Cyanide
Mercury Succinimide
Mercury Iodide
Red Mercury Biniodide
Mercury Iodide
Yellow Mercury Proto-iodide
Black (Hahnemann), Soluble Mercury Oxide
Red Mercury Oxide
Yellow Mercury Oxide
Mercury Salicylate
Mercury Succinimide
Mercury Imido-succinate
Mercury Sulphate
Basic Mercury Subsulphate; Turpeth Mineral
Mercury Tannate
Mercury-Ammonium Chloride.