Reddish brown smoky liquid. The relative density is 3.119 (20ºC). Melting point -7.2ºC, boiling point 58.78ºC. At low temperature (-20ºC), it is dark red acicular crystal with metallic luster. Evaporates quickly at room temperature, and its vapor has a choking stimulus taste and is reddish brown. Slightly soluble in water, the solubility is 3.58g/100ml water (20ºC); Soluble in ethanol, ether, chloroform, carbon tetrachloride, kerosene and carbon disulfide and other organic solvents; It is also soluble in hydrochloric acid, hydrobromic acid and bromine compound solutions. Its chemical properties are similar to chlorine but slightly weaker, so the bromine in the bromide can be removed by free chlorine. Is a strong oxidizing agent, in the presence of water, bromine can oxidize sulfur dioxide into sulfuric acid and produce hydrogen bromide; Nitrogen is produced by the oxidation of nitrogen compounds such as ammonia and urea by bromine in alkaline medium. In the gas phase, bromine oxidizes ammonia into free nitrogen and produces white ammonium bromide smoke, which is often used to check whether bromine leaks from equipment and pipelines in production. Bromine is more stable than chlorine in the presence of hypobromic acid. In sunlight, if hypobromic acid is present, it is more stable than chlorine. Poisonous, corrosive.