Ntawm cov khoom siv hauv chaw ua haujlwm niaj hnub, cov khoom siv phau ntawv luam ntawv yeej ib txwm yog cov khoom siv hauv chaw ua haujlwm txhua hnub. Hauv kev tsim cov phau ntawv sau, nws tuaj yeem hais tau tias ntau tus neeg siv tau lees paub ntau dua los ntawm cov tuam txhab luam ntawv, thiab ntau yam khoom siv phau ntawv luam ntawv uas lawv tsim tsis yog tsuas yog cov khoom zoo, thiab tus nqi tsim nyog, hnub no, peb yuav muab cov lus qhia luv luv rau koj. rau kev nkag siab yooj yim ntawm luam ntawv phau ntawv, vam tias yuav yog ib qho kev pab rau koj.
Nyob rau hauv cov txheej txheem ntawm cov khoom siv phau ntawv sau, phau ntawv luam ntawv cov lag luam feem ntau ua cov khoom raws li qhov sib txawv ntawm cov neeg siv sib txawv. Cov txheej txheem ntau lawm ua rau tus nqi zoo tshaj plaws ntawm phau ntawv luam ntawv cov khoom lag luam.
Cov ntawv sau cov ntaub ntawv, luv luv-khiav xoom-khiav luam ntawv nrog cov kev xav tau zoo, tuaj yeem luam tawm ntawm daim ntawv (zinc oxide phaj) maj mam, txuag cov nqi phaj, compressing nqi luam ntawv, txuag lub sijhawm, thiab ceev thiab ua haujlwm zoo.
Tsis tas li ntawd, thaum cov tuam txhab luam ntawv ntau lawm muab cov neeg siv khoom siv phau ntawv luam tawm, lawv kuj muaj cov qauv thiab cov lus qhia tshwj xeeb hauv kev xaiv cov ntawv luam ntawv. Nyob rau hauv cov nqe lus ntawm cov ntawv luam ntawv, ob daim ntawv nplaum thiab cov ntawv sau yog cov tseem ceeb. Yog tias lawv raug cais raws li qhov hnyav ntawm daim ntawv, gram hnyav ntawm ntawv yog hais txog gram hnyav ntawm daim ntawv ib square meter.