Fruit ak lujum, xeetu filmu bu bari ay pore yu ndaw ci kaw suuf si, ak pore yu tollu ci 0.01 μ m ba 10 μm. Amna lu bari luñu mëna noyyi, lu ci melni transmisioŋ biy joxe ndox mu bari, waaye mën nañu ko jàppee ni ndox mi ndoxe. Place plastik bu am pour plastik ak paquet plastik permeable amna ay xeeti mbir yu mel noonu, ak ñaari pore yu ndaw. Waaye, pore yi ci kaw paketu plastik yu ndaw yi dañu tëju, loolu mooy tax permeabilite bi di permeability waaye du permeability ndox. Pore yi ci filmu bi ñuy permeable duñu tëju, am formu funnel. Formu pore yi ci kanam ak ginaaw filmu bi wuute nañu, loolu mooy tax ñu mëna permeabilite.
