Gallium is a rare silver-white metal. Density 5.904 g/cm 3. The melting temperature of 29.78 ℃. The boiling point of 2403 ℃.Due to the complex structure of the stable solid, the pure liquid has a significant tendency to undercool and can be placed in an
ice bath for several days without crystallizing. Soft, brittle, stable performance in the air. Heat soluble in acids and bases;
Reacts violently with boiling water, but only slightly with water at room temperature. Can interact with most metals at high
temperature. From liquid to solid, expansion rate of 3.1%, suitable for storage in plastic containers.
Gallium is used to make optical glass, vacuum tubes and semiconductors. A quartz thermometer is installed to measure high
temperature. Alloys that are easy to heat treatment can be made by adding aluminum. Alloys of gallium and gold are used in
decorative and dental applications. It is also used as a catalyst for organic synthesis. Mainly used in the field of electronics industry and communication, it is the raw material for making various gallium compound
semiconductor, dopant of silicon and germanium semiconductor, and heat exchange medium of nuclear reactor.