inert gas 
noun
Another term for noble gas.Krypton is the fourth member of Group 18 of the periodic table, a group of elements known as the noble gases or inert gases....
- Fluorine gas, diluted with an inert gas such as nitrogen, can now be used to fluorinate selectively a range of systems by simply passing this gaseous mixture through a cold solution of the substrate in formic or other acid.
- Natural gas contains other compounds than hydrocarbons, including significant quantities of gases such as carbon dioxide, nitrogen, and hydrogen sulphide and traces of inert gases such as helium.
- non-essential
- non est
- non est factum
- non est inventus
- nonesuch
- Nonesuch chest
- Nonesuch ornament
- nonet
- none the less
- nonetheless
- none the worse for
- none too
- none too ——
- non-Euclidean
- non-European
- non-evaluative
- non-event
- no news is good news
- non-excessive
- non-exclusive
- non-exclusivity
- non-exec
- non-executing
- non-execution
- non-executive