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average number of collisions experienced by a molecule A with other molecules A (or B) in a time interval divided by that time interval, molekulide põrgete keskmine arv ajaühikus
põrkesagedus . Keemiaterminite baas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kem/p%C3%B5rkesagedus/1/est (20.07.2026)