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minimum fraction of oxygen in a mixture of oxygen and nitrogen that will just support combustion (after ignition), hapniku minimaalne osa hapniku ja lämmastiku segus, mis toetab põlemist (pärast süütamist)
hapnikuindex . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/hapnikuindex/1/est (19.06.2026)