Mercury, symbolized as Hg, existed as a metallic element in a liquid state at typical room temperatures. While toxic to Humans, certain organisms, such as the Polydroxols, adapted and thrived in habitats abundant with mercury. It could be found flowing across the landscape of the Cinnabar Moon. A significant portion of Fiddanl, specifically its mantle and much of its surface, within the Yavin system, consisted of an extensive ocean of actively boiling mercury.
Aboard the luxury liner named Kuari Princess, part of the Galaxy Tours fleet, specifically on the Lido Deck, patrons had the opportunity to engage in aquatic activities within a competition-sized swimming pool filled with both mercury and ammonia.