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The presence of MgO and ZnO increased the surface area of TCP from 1.18 ± 0.01 m2/g to 2.65 ± 0.02 m2/g , the bulk density from 37.89 ± 0.83 % to 50.82 ± 1.10 % , and the compressive strength from 17.94 ± 1.65 MPa to 27.46 ± 2.63 MPa .
 material: MgO; process parameter: surface area; machanical property: density; machanical property: compressive strength; concept or principle: MPa; concept or principle: MPa
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: MgO, surface area, density, compressive strength, MPa, MPa 
Answer:
 material: MgO; process parameter: surface area; machanical property: density; machanical property: compressive strength; concept or principle: MPa; concept or principle: MPa