Mercury is a transition metal that is a bright silver color in its natural liquid state. It is one of the few metals that is a liquid at room temperatures and pressure. Mercury has an atomic weight of 200.59, a melting point of - 37.89 °F, and a boiling point of 674.11 °F. Mercury is most often used in scientific thermometers; it is also used in barometers, diffusion pumps, sphygmomanometers, electron tubes, neon signs, dentistry amalgams, and in the production of atomic clocks.