Carl Wilhelm Scheele distinguished the component of air supporting combustion from the air remaining after it was consumed. His experiments on fire-air, now identified as oxygen, used different chemical preparations and combustion observations to establish that ordinary air was a mixture rather than one uniform substance.[ref]
Chemist whose Chemical Treatise on Air and Fire by Carl Wilhelm Scheele records independent investigations of oxygen.
Figure 1.
Portrait of Carl Wilhelm Scheele
. Ida Falander (1842–1927); turn-of-the-20th-century likeness, sourced by Commons to the Royal Society of Chemistry. Public domain: life plus 70 years or fewer; United States publication before 1930 as stated on File. Source usage terms, via Wikimedia Commons. Source.

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