Ma'auni na sinadarai yana nufin yanayin da adadin martanin gaba ya yi daidai da adadin koma-bayan da ake samu a cikin jujjuyawar sinadarai. A ma'auni, ƙididdiga na masu amsawa da samfurori sun kasance masu tsayi kuma babu wani canji mai sauƙi a cikin tsarin gaba ɗaya. A wasu kalmomi, halayen gaba da baya suna faruwa daidai gwargwado, kuma tsarin ya bayyana yana "mako" a cikin kwanciyar hankali. Wannan jihar tana da ƙayyadaddun ma'auni na ƙayyadaddun ma'auni kuma ana gudanar da ita ta ka'idodin thermodynamics.