18386
Formation of linear gradients was shown using the fluids of the same density by both diffusive mixing at flow rates of 0 . 001 mL / min and in a convective mixing regime at flow rates of 20 mL / min .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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