inert gas

noun Chemistry.

Origin:
1900–05

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Collins
World English Dictionary
inert gas
 
n
1.  noble gas, rare gas, Also called: argonon any of the unreactive gaseous elements helium, neon, argon, krypton, xenon, and radon
2.  (loosely) any gas, such as carbon dioxide, that is nonoxidizing

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American Heritage
Medical Dictionary

inert gas n.
See noble gas.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
inert gas  
See noble gas.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Energy-efficient windows are typically double-paned, with an inert gas such as
  argon or krypton between the panes.
Now these implants are stored in a vacuum or inert gas, which prevents the
  destructive oxidation.
His laser would probably work better if he used an inert gas shield around the
  emitter.
The containment vessel is typically filled with an inert gas to prevent an
  explosion from happening.
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