why oxygen previously called fir e air
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Explanation:
He had produced oxygen gas by heating mercuric oxide (HgO) and various nitrates in 1771–2. Scheele called the gas "fire air" because it was then the only known agent to support combustion. ... He noted that candles burned brighter in the gas and that a mouse was more active and lived longer while breathing it.
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Answer:
One he called "vital air" (oxygen), which is needed for combustion and respiration. The other (nitrogen) he called "azote", which means "lifeless" in Greek.
The name oxygen comes from the Greek word "oxygenes" meaning "acid producer". It was called this because early chemists thought that oxygen was necessary for all acids.
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