Mercury, the only liquid metal on our planet

Mercury – Hg (hydrargyrium) is the only liquid metal on the globe. When cooled to -38.9 °C, it becomes solid as steel and can be forged, while its boiling point is at 356.7 °C.

Due to its exceptional density (1 litre of mercury weighs as much as 13.56 kg), an iron ball will easily float on mercury.

Owing to its properties, the applicability of mercury was universal – it was used in the extraction of gold and silver, in medicine, cosmetics, dentistry, the chemical and war industries, agriculture; its equal expansion was utilised in thermometers and its conductivity in the electricity industry. Alchemists were convinced that all metals are derived from mercury and sulphur, and that these two elements could be used to make gold and the philosopher's stone.