编辑“︁氮”︁（章节）

===液氮===
{{main|液氮}}
[[File:Nitrogen.ogv|thumb|浸入液氮的气球]]
[[File:A cylinder container, containing liquid nitrogen.jpg|thumb|装有液氮的容器]]
液氮是外观像[[水]]的[[低温]]液体。它可用[[杜瓦瓶]]储存和运输。<ref>{{Cite journal|doi=10.1007/BF01136404|title=Vessels for the storage and transport of liquid oxygen and nitrogen|author=Kaganer, M. G.|author2=Kozheurov, V.|author3=Levina, Zh. L.|name-list-style=amp|journal=Chemical and Petroleum Engineering|volume=3|issue=12|year=1967|pages=918–22|s2cid=96762552}}</ref>和[[干冰]]一样，液氮主要用于创造低温。液氮可以[[深低温保存|保存]][[血液]]、[[精子]]、[[卵子]]等生物样品。在{{le|冷疗手术|Cryosurgery}}中，液氮可以冻结和移除皮肤的囊肿和疣。<ref>{{cite journal|pmid=11359389|volume=144|issue=5|title=Liquid nitrogen cryotherapy of common warts: cryo-spray vs. cotton wool bud|url=https://archive.org/details/sim_british-journal-of-dermatology_2001-05_144_5/page/1006|date=May 2001|journal=Br. J. Dermatol.|pages=1006–09|author=Ahmed I|author2=Agarwal S|author3=Ilchyshyn A|author4=Charles-Holmes S|author5=Berth-Jones J|doi=10.1046/j.1365-2133.2001.04190.x|s2cid=221325640}}</ref>实验室的{{le|冷阱|cold trap}}和{{le|低温泵|cryopump}}也会使用液氮。它还可以冷却{{le|红外探测器|infrared detector}}和{{le|X射线探测器|X-ray detector}}等热敏电子产品。液氮通常用于使东西的温度变得像它那样低，但由于液氮价格便宜，所以即使不需要它那么低的温度，它也被用于冷冻各种东西，如食物。{{sfn|Greenwood|Earnshaw|1997|pp=409–11}}