pervaporation

noun
per·vap·o·ra·tion | \(ˌ)pər-ˌvap-ə-ˈrā-shən \

Medical Definition of pervaporation 

: the concentration of a colloidal solution whose colloid will not pass through a semipermeable membrane by placing the solution in a bag made of the membrane material and blowing warm air against the surface of the bag

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