Mercury, also known as mercury, is a chemical element with the chemical symbol Hg and atomic number 80.  It is a silver white liquid transition metal, usually in liquid form at room temperature.  Mercury has been used as a material for making thermometers in history, and due to its high density and good conductivity, it is also widely used in the manufacturing of electronic and electrical products.  In addition, mercury has a wide range of applications in industry and medicine due to its low toxicity and ease of forming alloys with various substances