Mercury is a liquid metal with a boiling point of 356.6 °C and a melting point of 38.9 °C. It is odorless, and its vapors are 7 times heavier than air. Mercury accumulates on the lower floors of a room due to its freezing point of 0 °C. Metallic mercury vapors can enter the body through the respiratory tract and accumulate in various organs, such as the liver, kidneys, spleen, and brain.