The most dense metal on Earth is osmium, which weighs 22.6 kilograms per liter. The element osmium is so dense that a block that is 2 cubic feet in size weighs about the same as a 3,400-pound automobile. Osmium has twice the density of lead, and it is heavier than other metals found on Earth, such as gold and tungsten.
Osmium is a brittle and hard metal that is mainly retrieved during the processing of nickel and platinum ores. It is mostly used to produce extremely tough alloys. It is also used to manufacture electrical contacts, ball point pens, record player needles and fountain pens. Osmium was originally discovered in 1803 by a British chemist named Smithson Tennant.