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This mass is compared to the theoretical value using densities for the material and the volume of the object .
 concept or principle: theoretical; material: material; concept or principle: volume
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: theoretical, material, volume 
Answer:
 concept or principle: theoretical; material: material; concept or principle: volume