Argon (element)
Argon was a gas.
The Tenth Doctor described fresh air as "Nitrogen, oxygen, a pinch of argon, a soupçon of carbon dioxide and a squeeze of H₂O" after filtering the ammonia from Chelsea 426 to remove Rutan spores that infected humans. (PROSE: The Taking of Chelsea 426) The Eighth Doctor could detect trace amounts of argon in Earth's atmosphere. (PROSE: Father Time)
Some car headlights and lamps were argon based. (PROSE: Heart of TARDIS, Tragedy Day)
The Fifth Doctor kept argon discharge globe lights in the TARDIS. (TV: Frontios)
Thea Ransome performed a potassium-argon test in the dating of "Eustace". (TV: Image of the Fendahl)
A control panel on Orbit Station 3 had three dials to control the mixture of gasses. Dial A was for oxygen, dial B was for nitrogen, and dial C was for a mix of argon, carbon dioxide, and other gases. (PROSE: The Planet of Oblivion)
When the Flux "jumbled" a number of words relating to the Thirteenth Doctor's past, "regeneration" was among them, and was scrambled into "argon teenier". (GAME: Flux Fixers [+]Loading...["Flux Fixers (game)"])
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