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The average thermal conductivity of fabricated porous structures was determined between 6-14 W/m·K and found to be a function of porosity .
 average, conductivity, fabricated, be, porosity
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 average, conductivity, fabricated, be, porosity