3584
Upon validation of the IR parameters for a melted area , experimentation was conducted to also determine powder emissivity ( found to be 0.50 ) .
 validation, IR, melted, area, powder, be
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:
 validation, IR, melted, area, powder, be