Taw qhia rau saw cov tshuaj tiv thaiv
Chain reaction (lossis cov saw tiv thaiv, Kev sib txuas ntawm saw hlau) txhais tau hais tias cov khoom lag luam lossis cov khoom siv ntawm cov tshuaj tiv thaiv tuaj yeem siv los ua cov ntaub ntawv raw rau lwm cov tshuaj tiv thaiv, yog li cov tshuaj tiv thaiv tshwm sim ntau zaus. Hauv kev siv tshuaj, kev sib hloov cov saw feem ntau hais txog lub teeb, cua sov, hluav taws xob, lossis tus pib, uas hloov pauv lwm tus neeg ua haujlwm nruab nrab (xws li atoms dawb lossis dawb radicals) hauv cov tshuaj tiv thaiv, thiaj li hais tias cov tshuaj tiv thaiv txuas ntxiv mus. Nws yog cov khoom sib txuam ntau dua ntawm cov khoom siv thaum ub.