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- Oxygen - Wikipedia
They realized that the known reversible reaction 2BaO (s) + O2 (g) ↔ 2BaO2 (s) was deactivated by the formation of barium carbonate from carbon dioxide in the air; treating air to remove the carbon dioxide allowed the reaction be reversed indefinitely
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- 氧气（氧元素形成的一种单质）_百度百科
氧气（oxygen）是氧元素最常见的单质形态，分子式O2，相对分子质量32。 在标准状况下，两个氧原子结合形成氧气，是一种无色、无嗅、无味的双原子气体。 氧气是空气的组分之一，占了空气体积的20 9%。
- Oxygen | O2 | CID 977 - PubChem
Oxygen (O2) is reduced by both enzymatic and nonenzymatic processes to the superoxide radical (O2-) This radical species of oxygen is postulated to be formed in vivo in animals through activity of some iron - sulfur oxidation-reduction enzymes and certain flavoproteins
- 氧 - 维基百科，自由的百科全书
O 2 {\displaystyle {\ce {O2}}} 逸出。 注意：因為氬的沸點 (零下186度)與氧相近，此時逸出者為氧氬混合氣體。 若需提純氧仍需再將溫度降低至氬結凍後才能提取純氧 (氬的熔點為零下190度，高於氧的熔點零下219度)。 另一常用方法主要利用 沸石 做成兩個相同的分子篩。
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