pervaporation
noun
per·vap·o·ra·tion
(ˌ)pər-ˌvap-ə-ˈrā-shən
: 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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Merriam-Webster unabridged
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