As the most abundant gas in the air, nitrogen is inexhaustible and inexhaustible. It is colorless, odorless, and transparent. It is a sub-inert gas and does not sustain life. High-purity nitrogen is often used as a protective gas for places where oxygen or air is isolated. The content of nitrogen (N2) in the air is 78.084% (the volume components of various gases in the air are: N2: 78.084%, O2: 20.9476%, argon: 0.9364%, CO2: 0.0314%, and other H2 CH4, N2O, O3, SO2, NO2, etc., but the content is very small), molecular weight is 28, boiling point: -195.8°C, condensation point: -210°C.
