Yas ntxuam hniav yog cov khoom tseem ceeb uas tau siv dav hauv ntau hom khoom siv hluav taws xob. Lawv lub luag haujlwm tseem ceeb yog tsim kom muaj cua ntws los ntawm kev sib hloov, yog li ua kom yooj yim rau cua sov dissipation, qhov cua, lossis cua ncig.
Cov ntaub ntawv yas ua lub luag haujlwm tseem ceeb hauv kev tsim cov kiv cua vim lawv lub teeb yuag, kev tiv thaiv corrosion, tsis tshua muaj nqi, thiab yooj yim ntawm kev ua thiab molding.