Liquid nitrogen is inert, colorless, odorless, non corrosive, nonflammable, and extremely cold. Nitrogen makes up the major portion of the atmosphere (78.03% by volume, 75.5% by weight).

• 液态氮是惰性的，无色，无嗅，无腐蚀性，不可燃，温度极低。氮构成了大气的大部分（体积比78.；03%25，重量比75