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an indication of a definite standard of purity
noble gas, symbol Ar, of atomic mass 40, that composes 0.93% by volume of dry air
unit of metric land measurement; it equals 100 square metres
AR . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/AR/1/est (01.07.2026)
