TGA2型熱(re)(re)(re)重(zhong)分析(xi)儀(yi)(yi)是(shi)一種利(li)用(yong)熱(re)(re)(re)重(zhong)法檢測(ce)(ce)物(wu)質(zhi)溫度(du)(du)-質(zhi)量(liang)變(bian)(bian)化(hua)(hua)(hua)關系的(de)(de)儀(yi)(yi)器。熱(re)(re)(re)重(zhong)法是(shi)在(zai)(zai)程序控溫下(xia),測(ce)(ce)量(liang)物(wu)質(zhi)的(de)(de)質(zhi)量(liang)隨溫度(du)(du)(或時間)的(de)(de)變(bian)(bian)化(hua)(hua)(hua)關系。當被測(ce)(ce)物(wu)質(zhi)在(zai)(zai)加(jia)熱(re)(re)(re)過(guo)程中有升(sheng)華、汽(qi)化(hua)(hua)(hua)、分解出氣體(ti)或失(shi)去結晶水時,被測(ce)(ce)的(de)(de)物(wu)質(zhi)質(zhi)量(liang)就(jiu)會發生(sheng)變(bian)(bian)化(hua)(hua)(hua)。這時熱(re)(re)(re)重(zhong)曲(qu)(qu)線(xian)就(jiu)不是(shi)直線(xian)而是(shi)有所下(xia)降。通過(guo)分析(xi)熱(re)(re)(re)重(zhong)曲(qu)(qu)線(xian),就(jiu)可以知道被測(ce)(ce)物(wu)質(zhi)在(zai)(zai)多少度(du)(du)時產生(sheng)變(bian)(bian)化(hua)(hua)(hua),并且根據失(shi)重(zhong)量(liang),可以計算失(shi)去了多少物(wu)質(zhi),(如CuSO4·5H2O中的(de)(de)結晶水)。