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They found that the compressive strength decreased from 120 to 35 MPa when the porosity changed from 55 % to 75 % .
 machanical property: compressive strength; concept or principle: MPa; machanical property: porosity
Please list all entity words in the text that fit the category.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} 
Answer:
 machanical property: compressive strength; concept or principle: MPa; machanical property: porosity