Viscosity hnyav hauv kev tswj cov khoom ntawm cov dej ntws los ntawm cov kav dej, cov khoom zoo ib yam thiab cov cuab yeej siv tau ntev. Muab Lonnmeter viscometer nrog koj cov txheej txheem kev lag luam rau:
✤ Ua kom cov khoom zoo sib xws los tiv thaiv cov khoom rov qab thiab rov ua haujlwm dua;
✤ Ua kom lub zog ua kom zoo dua qub los yog cov qauv hauv kev siv los yog kev sib xyaw ua ke;
✤ Tiv thaiv cov khoom siv los ntawm kev tswj cov kua dej uas muaj viscosity;
✤ Ceev cov khoom tsim nrog cov ntaub ntawv rheological meej;
✤ Txo thiab tiv thaiv kev pheej hmoo ntawm kev kis kab mob lossis kev puas tsuaj.