It can exist as a liquid at room temperature or as a solid crystal salt. The liquid metal form gives off invisible, odorless, toxic vapors. Commonly, metallic mercury can be found in thermometers, barometers, electrical switches, thermostats and in dental fillings. When mercury is released from industries into the air, it can travel long distances and be deposited on soil and in lakes. Some lakes in Wisconsin have health advisories that recommend against eating too much of certain types of fish containing high levels of methylmercury.
Organic mercury is the most poisonous form.
It is used as a fungicide and preservative for seeds, wood products, and paper products. In homes, organic mercury can be found in latex paints, and metallic mercury is sometimes used in religious rituals. People can be exposed by breathing mercury vapors. This type of exposure can happen in the workplace, or in homes where mercury is spilled. People who use exterior latex paints that contain mercury in unventilated areas may be exposed and could become seriously ill.