ÐÅÀÊÖÈß ÍÅÎÁÐÀÒÈÌÀß — ïðîòåêàþùàÿ â îäíîì íàïðàâëåíèè; îáóñëîâëåíà ñèëüíûì ñìåùåíèåì â îäíó ñòîðîíó ðàâíîâåñèÿ êàêîé-ëèáî îáðàòèìîé ðåàêöèè.
