Kev xaiv ntawm qhov tsim nyog flux nyob ntawm seb yam xws li cov khoom siv vuam, cov txheej txheem cua sov, thiab cov txheej txheem txheej txheem. Thaum xaiv qhov tsim nyog flux, cov hauv qab no yuav tsum tau xav txog:
1. Hom thiab thickness ntawm cov khoom siv vuam;
2. Cov txheej txheem cua sov;
3. vuam kub;
4. Ib puag ncig tej yam kev mob;
5. Yuav tsum tau vuam ceev thiab qhov tsis xws luag.
