Cov khoom tseem ceeb yog txhua yam kev qhia tshwj xeeb rau butyl puab raj thiab cov khoom siv raw, nrog rau cov tsheb thauj khoom hauv lub raj, cov neeg caij tsheb hauv lub raj, lub log tsheb, maus taus puab raj thiab lub tsheb kauj vab hluav taws xob sab hauv, thiab lees txais kev kho qhov tshwj xeeb zoo li lub raj sab hauv.Cov qauv, formulation thiab tsim ntawm peb cov khoom tau raug sim scientific ntawm qhov chaw.Lawv muaj ntau yam zoo, xws li kev ruaj ntseg zoo, muaj peev xwm ua tau zoo, muaj zog tiv thaiv kev laus thiab kev pab lub neej ntev, muab cov neeg siv nrog ntau yam kev daws teeb meem log tsheb.