PPM thiab PPB yog cov khoom siv hauv atmospheric chemistry los piav txog qhov concentration ntawm cov pa roj. PPM sawv cev rau qhov chaw ntawm cov pa roj ib lab qhov chaw ntawm huab cua, thiab PPB yog parts per billion.
ppb txhais li cas hauv kev xa ntawv?
" Parts Per Billion" yog cov ntsiab lus ntau tshaj plaws rau PPB ntawm Snapchat, WhatsApp, Facebook, Twitter, Instagram, thiab TikTok.
Pb tus nqi yog dab tsi?
Ib feem ntawm ib billion (ppb) qhia ib feem ntawm 1, 000, 000, 000 (10 9) ntu, thiab tus nqi ntawm 10 -9. Qhov no sib npaug li peb vib nas this ntawm ib puas xyoo.
ppb txhais li cas hauv kev tsim khoom?
Los ntawm Wikipedia, phau ntawv qhia dawb. PPB tuaj yeem sawv cev rau: Ntau lawm-tsim ciam teb, daim duab qhia qhov sib txawv ntawm ob yam khoom uas kev lag luam tuaj yeem tsim tau zoo nrog cov khoom tsim tau tsawg.
ppb sawv rau dab tsi?
PPM thiab PPB yog cov khoom siv hauv atmospheric chemistry los piav txog qhov concentration ntawm cov pa roj. PPM sawv cev rau qhov chaw ntawm cov pa roj ib lab qhov chaw ntawm huab cua, thiab PPB yog parts per billion.
