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The oxygen may be diminished to 75% of it's normal percentage in air before appreciable symptoms develop.
Other uses incude non-reactive blanket in the manufacture of titanium and other reactive elements and as a protective atmosphere for growing silicon and germanium crystals.
The first symptoms produced by a simple asphyxiant are rapid respirations and air hunger.
Mental alertness is diminished and muscular coordination is impaired.
The most exotic use of argon is in the tyre of luxury cars.
In earth's atmosphere, Ar-39 is made by cosmic ray activity, primarily with Ar-40.
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At low oxygen concentrations, unconsciousness and death may occur in seconds without warning.