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| diatomic oxygen | |||
| oxygen A gaseous chemical element; an essential element in cellular respiration and in combustion processes; the most abundant element in the earth's crust and about 20% of the air by volume | |||
| E 948; oxygen | |||
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oxygen : 19 do fraz, 7 tematyki |
| Chemia | 3 |
| Elektronika | 3 |
| Hutnictwo | 6 |
| Nauka o ziemi | 2 |
| Ochrona środowiska | 2 |
| Technika i technologia | 1 |
| Transport | 2 |