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Additionally , the effects of the input variables , including powder flow rate , gas flow rate and particle size , on the powder stream distribution were also analyzed .
 powder flow rate, gas flow rate, particle, powder, distribution
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:
 powder flow rate, gas flow rate, particle, powder, distribution