(1) Tag nrho ntawm elasticity thiab resilience;
(2) Tsim nyog siv tshuab, nrog rau nthuav lub zog, elongation thiab tsim kua muag kuj.
(3) Qhov kev ua tau zoo yog ruaj khov, nws tsis yooj yim o rau hauv nruab nrab, thiab cov thermal shrinkage effect (Joule effect) yog me me.
(4) Nws yog qhov yooj yim rau cov txheej txheem thiab cov duab, thiab tuaj yeem tswj qhov ntev.
(5) tsis xeb qhov sib chwv, tsis ua paug rau qhov nruab nrab, thiab lwm yam.
Cov khoom siv uas tsim nyog thiab siv tau los ua kom tau raws li cov lus teev saum toj no yog roj hmab, yog li lub nplhaib sib khi feem ntau yog ua los ntawm roj hmab. Muaj ntau ntau hom roj hmab, thiab hom roj hmab tshiab yog tas li pom. Thaum tsim qauv thiab xaiv, ib tus yuav tsum nkag siab txog cov yam ntxwv ntawm ntau yam kev txhuam thiab xaiv lawv tubntxhais.
