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Volume I of " Experiments and Observations on Different Kinds of Air " outlined several discoveries : " nitrous air " ( nitric oxide , NO ) ; " vapor of spirit of salt " , later called " acid air " or " marine acid air " ( anhydrous hydrochloric acid , HCl ) ; " alkaline air " ( ammonia , NH ) ; " diminished " or " dephlogisticated nitrous air " ( nitrous oxide , NO ) ; and , most famously , " dephlogisticated air " ( oxygen , O ) as well as experimental findings that showed plants revitalised enclosed volumes of air , a discovery that would eventually lead to the discovery of photosynthesis .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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