Npuas taw tes: qhov tsawg kawg nkaus siab yuav tsum tau rau cov roj extrude los ntawm lub loj tshaj plaws membrane pore nyob rau hauv lub tag nrho wetted ntxeem tau daim nyias nyias thiab tsim ib tug nruam, ruaj khov los yog loj npaum li cas ntawm cov roj ntws.
Cov huab cua ntws dhau los ntawm lub qhov dej ntub dej lim dej hauv qab lub siab, thiab cov kua dej yog nyem tawm ntawm lub qhov dej loj dua, tso cai rau "cov huab cua loj" dhau mus.
Npuas taw tes yog ib hom kev kuaj tsis muaj kev puas tsuaj uas yog raws li qhov nro saum npoo uas muaj nyob rau hauv qhov ntawm cov lim membrane vim yog cov kua thiab txoj kev xav ntawm capillaries pulsation phenomena. Nws yog txoj hauv kev tseem ceeb tshaj plaws los ntsuas seb lub lim membrane puas zoo lossis tsis, thiab ua tau raws li qhov yuav tsum tau ua.
Bubble point test yog ib txoj kev kuaj uas tsis muaj kev puas tsuaj, uas yog lub hauv paus ntsiab lus ntawm qhov nro thiab capillary qhov tshwm sim muaj nyob rau hauv cov kua hauv lub lim membrane pores; nws ua tau raws li qhov yuav tsum tau ua thiab yog ib txoj hauv kev tseem ceeb los ntsuas cov lim dej kom ncaj ncees.
Thaum lub lim dej tiav lawm, cov roj hauv cov roj theem yuav thawb tawm cov kua adsorbed los yog kaw rau hauv capillary qhov thaum kov yeej qee yam ntawm cov kua nto nro, nyob rau hauv qhov kev sib raug zoo ntawm qhov nro rau lub cev lub cev ntawm capillary qhov,lub aperture yog inverse proportional to the pressure for the generation of the first bubble while passing through the compressed air and is in proportional to the pressure value for passing through the maximum pore kwj dej, uas yog hu ua npuas taw tes ntawm daim nyias nyias. Yog li, qhov siab tshaj plaws aperture tus nqi ntawm cov pav ca lim membranes thiab cov membranes nrog ib kab-zoo li lub lim lim tuaj yeem txheeb xyuas.