Nta ntawm xam txhais tau tias
Ar Cov qauv lej txhais tau tias yog qhov zoo concentration ntau, uas muaj qhov zoo ntawm kev ua kom zoo, kev txiav txim siab nruj me ntsis, txhim kho qhov yooj yim thiab daws tau yooj yim, cov lus yooj yim, haum rau kev suav ntxiv thiab cov cawv me me los ntawm kev hloov ua piv txwv.
Average Cov ntsuas nruab nrab yog qhov tsis haum rau cov ntaub ntawv huab. Qhov no yog vim hais tias qhov nruab nrab tau teb, thiab txhua qhov hloov pauv ntawm cov ntaub ntawv yuav cuam tshuam rau qhov kawg tshwm sim.