Nitrogen at room temperature and atmospheric pressure is colorless, odorless, non-toxic and non-combustible gases. Boiling point of -195.8 �� Under normal conditions, the reaction of nitrogen for most of the conditions are relatively lazy. At room temperature under nitrogen element can be fixed in the biological system. The mechanism of this process is still unknown. In addition, the recently has been that some transition metal complexes with atmospheric nitrogen rapid response. Under high temperature, nitrogen become more lively, and with the hydrogen, oxygen and some metal-binding: 3H2 + N2 → 2 NH3 O2 + N2 → 2 NO 3M + N2 → M3N2 (M = Ca, Mg, Ba) in the low-pressure nitrogen gas when through a glow discharge, nitrogen will become very lively, this form of nitrogen called reactive nitrogen. reactive nitrogen easily with many metals (Hg, As, Zn, Cd and Na) and non-metallic (P and S) to form nitrogen compounds.