stoi·chi·om·e·try /ˌstɔɪkiˈɑmətri/
  化學計量; 化學計算; 化學計演算法
  stoi·chi·om·e·try /ˌstɔɪkɪˈɑmətrɪ/ 名詞
  化學計量學,化學量論
  Stoi·chi·om·e·try n.  The art or process of calculating the atomic proportions, combining weights, and other numerical relations of chemical elements and their compounds.
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  stoichiometry
       n : (chemistry) the relation between the quantities of
           substances that take part in a reaction or form a
           compound (typically a ratio of whole integers)