Gallium, liquid
Liquid gallium metal, under very dilute hydrochloric acid, which dissolves the very thin oxide layer giving the metal similar appearance to mercury (more concentrated acid can attack the metal). Gallium is one of the 4 metals that is a liquid at 30 C (3 other metals include cesium, francium and mercury). Its melting point is 29.7646 °C, but has a tendency to supercool below this temperature.
Gallium, liquid
Liquid gallium metal, under very dilute hydrochloric acid, which dissolves the very thin oxide layer giving the metal similar appearance to mercury (more concentrated acid can attack the metal). Gallium is one of the 4 metals that is a liquid at 30 C (3 other metals include cesium, francium and mercury). Its melting point is 29.7646 °C, but has a tendency to supercool below this temperature.