Definition - What does Heavy Metal mean?
Heavy Metal is a metallic chemical element which displays metallic properties including comparable high density and is poisonous or toxic at low concentrations. It is an element which has high atomic weight and its density is five times greater than that of water. Heavy Metals include the transition metals, metalloids, antimony and arsenic. They are natural components present in the Earth’s crust which cannot be destroyed or degraded. Some of the Heavy Metals have alcove uses or are very toxic while others are important in trace amounts.
Petropedia explains Heavy Metal
Heavy Metals generally have a good thermal and electrical conductivity. The pure forms of these metals have the metal specific gravity, atomic numbers and mass. Among the transition metals, there are various elements which play an essential role in the metabolic functions for a wide range of organisms - iron, manganese, molybdenum, copper, cobalt and nickel. They are capable of forming insoluble soaps in soap chemistry which are used in fungicides, lubricating greases and paint dryers. Some Heavy Metals notably silver and gold are the basis of currency in various countries of the world. Other Heavy Metals such as lead, mercury and cadmium are hazardous because of their selective or intrinsic toxicity principally in the environmental contexts.