3860
The thermal conductivity trend was not fully explained by the porosity , as effective medium models fail to predict the trend .
 thermal conductivity, porosity, as, trend
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:
 thermal conductivity, porosity, as, trend