21778
We modeled these adsorption processes under two different statistical mechanical ensembles : the grand canonical ( V - Nz - mu g - T or GC ) ensemble keeping volume fixed , and the P - Nz - mu g - T ( osmotic ) ensemble allowing volume to fluctuate .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None