scientists who proved air is a mixture of gases

European  Leonard da Vinci (1452-1519), observed that air was not an element but contained several gases. 
In 1630, Jan van Helmont proposed that certain gases can be separated from air
Later, in 1669, John Mayow observed that air contains oxygen and some other gas.
In 1772 Daniel Rutherford  it was observed that air contains mainly nitrogen gas as another composition.

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