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惰性气体

An inert gas is a gas which does not change under a given set of conditions.  Inert gases are often used in welding, sealing, or marking applications in an effort to avoid unwanted chemical reactions which may degrade a part. These unwanted reactions include oxidation and hydrolysis which are reactions with oxygen and the moisture in air.

由于其天然丰度高 (空气中含78% 氮气2, 1% 氩气)、成本相对较低,经过提纯的氮气和氩气是最常用的惰性气体。