Zinc (Chinese pronunciation: xīn), its name 'zinc' is derived from the Latin Zincum, meaning 'white thin layer' or 'white sediment'. The chemical symbol is Zn, which has an atomic number of 30 and a relative atomic mass of 65. Zinc is a silvery whiteish light blue metal with a density of 7.14 g/cc and a melting point of 419.5 °C. At room temperature, the property is brittle;

 when it is 100 to 150 ° C, it becomes soft; after it exceeds 200 ° C, it becomes brittle. The chemical nature of zinc is active, and in the air at normal temperature, a thin and dense basic zinc carbonate film is formed on the surface to prevent further oxidation. When the temperature reached 225 ° C, the zinc was violently oxidized.