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In chemical thermodynamics the term used for the chemical potential energy is chemical potential , and for chemical transformation an equation most often used is the Gibbs-Duhem equation .
 person: Gibbs-Duhem
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Gibbs-Duhem 
Answer:
 person: Gibbs-Duhem