Flawed demonstration The air we breathe is made up of about 78% nitrogen by volume, 21% oxygen and much smaller amounts of argon, carbon dioxide, hydrogen and other gases.

CO2/Argon dual gauge regulators are used in automotive, building, melting, and medical industries. The project cost over 2 billion rials (about $80,000), Iran's IRIB reported on April 29.

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Almost all that residual stuff is the single element argon. Carbon dioxide is 20 times less prevalent than even argon. Amazingly, CO 2 only comprises 1/25 of 1 percent of the air we breathe.

Markku Räsänen remembers making a neutral compound featuring argon, and ponders on the reactivity of this inert element.