Physicochemical properties
Molecular weight: 28.01
Melting point (℃) : -209.8 Relative density (water =1) : 0.81/-196℃
Boiling point (℃) : -195.6 Relative vapor density (air =1) : 0.97
Critical temperature (℃) : -147 Critical pressure (MPa) : 3.4
Solubility: slightly soluble in water, ethanol
Product use
Its chemical properties are not active, non-flammable is a kind of asphyxiating gas, in chemical, metallurgy, electronics and other industries used as replacement gas, protective gas. It is suitable for the production of calcium cyanamide in chemical industry. Pure nitrogen is used as a protective gas and lamp filling gas to prevent oxidation, volatilization and flammable substances. Liquid nitrogen is mainly used as a cold source, for the deep freezing treatment of instruments and machinery and food freezing, and also for low temperature micro-grinding and electronics industry.