Dar reaksiyahoi bargardanda, agar surati reaksiyai tarafi chap va rost bo ham barobar gardad, muvozinati khimiyavi (yo muvozinati dinamiki) menomand.
Agar muvozinati khimiyavi dar sistemai sarbasta boshad, ba chunin tamoil (qoida) rioya mekunad: a) tarkibi khimiyavii sis- temai dar holati muvozinat buda dar muddati tuloni tagyir na- meyobad; b) agar ba sistemai dar muvozinat buda az muhiti beru- na tasir rasonem, muvozinat muvaqqatan vayron meshavad va on bad az ba itmom rasidani tasiri beruna boz ba holati avvala barmegardad.
Tagyiryobii muvozinatro soli 1884 Le SHatele tarif dodast:
Agar ba sistemai dar holati muvozinati buda, yagon tasiri beruna rasonida shavad (harorat, fishor yo konsentratsiyai yake az moddaho tagyir yobad), muvozinat ba tarafi kamsha- vii in tasir mayl mekunad (melagjad).
Dar holati bo prinsipi Le SHatele amal kardan, imkoniyati idora namudani ravandi khimiyaviro ba dast meorem. Ba muvo- zinati khimiyavi tasiri omilhoi berunaro dar alohidagi dida mebaroem.