Cov txheej txheem rau cov pob tshab tsim nyog

Cov neeg ua haujlwm pob tshab ua lub luag haujlwm hauv kev tswj cov dej ua kom lub cev qhuav dej thiab cov tshuaj nkag mus, thiab lawv tuaj yeem yaj hauv ob qho kev daws teeb meem. Feem ntau cov pob tshab yog cov hydrocarbons, thiab lawv cov refractive index zoo ib yam li cov proteins. Thaum tus neeg saib xyuas lub cev qhuav dej tau hloov tag nrho, cov ntaub so ntswg ua pob tshab, yog li nws hu ua "pob tshab tus neeg saib xyuas".
Cov txheej txheem rau kev xaiv tus neeg sawv cev pob tshab tsim nyog yog:
Kev hloov pauv sai ntawm tus neeg ua kom lub cev qhuav dej
Yooj yim hloov melted paraffin wax
Cov ntaub so ntswg tsawg tsawg
Phem flammability
Tsawg toxicity
Tus nqi qis
Cov khoom siv pob tshab feem ntau yog xylene, turpentine, roj av, thiab lwm yam, uas tsis pom zoo.