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single number value ranging from 0,0 to 1,0 that describes the average sound absorption performance of a material, väärtusarv vahemikust 0,0 kuni 1,0, mis kirjeldab materjali keskmist heli neeldumisjõudlust
NRC . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/NRC/1/eng (05.07.2026)