This test proved it was oxygen, or, as Joseph Priestley had called it,'de-phlogisticated air '.
2.
When air had become completely phlogisticated it would no longer serve to support combustion of any material, nor would a metal heated in it yield a calx; nor could phlogisticated air support life.
3.
The residue of air left after burning, in fact a mixture of nitrogen and carbon dioxide, was sometimes referred to as " phlogisticated air ", having taken up all of the phlogiston.
4.
Using his observations, Cavendish observed that, when he had determined the amounts of phlogisticated air ( nitrogen ) and dephlogisticated air ( oxygen ), there remained a volume of gas amounting to 1 / 120 of the original volume of nitrogen.
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