Cov teeb meem tshwm sim uas yuav tsum tau them nyiaj rau hauv cov txheej txheem ntawm kev txhaj tshuaj yas
Vim tias cov hnab yas yuav tsum muaj cov kab mob siab, qhov zoo ntawm cov khoom siv yas yuav tsum nruj, thiab tsis pub muaj qaub ncaug, kua nplaum thiab tshuaj dawb. Cov teeb meem no muaj xws li cov neeg pluag, dub me ntsis, xim nqaij thiab ci, yog li cov txheej txheem ntawm cov khoom, cov khoom siv, pwm, kev txhaj tshuaj thiab kev tsim cov khoom, yuav ua tib zoo mloog thiab thov tshwj xeeb.
Secondly vim cov yas pob tshab ntau dua rau high melting point, pluag liquidity, yog li los xyuas meej ntawm qhov zoo ntawm cov khoom, feem ntau nyob rau hauv qhov siab, kev txhaj tshuaj, kev txhaj tshuaj ua kom me hloov rau cov txheej txheem, xws li thaum ua kev txhaj tshuaj yas yuav tsis tsuas yog pwm, thiab yuav tsis tsim kev ntxhov siab vim tshwm sim los ntawm kev rhuav tshem thiab cov khoom tawg.