Season 126 - Day 10 of 14

History of Science

In 1703, Georg Ernst Stahl came out with a scientific theory, based on J.J. Becher's concept of 'terra pinguis', which stated that compounds like metals contained a certain substance that is released upon ignition and subsequently absorbed by the air.
This theory later led to the discovery of oxygen.
With what term, derived from Ancient Greek, did Stahl refer to this substance?

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