Ppm
(Tùi Parts per million choán--lâi)
ppm, iā thang kóng pah-bān hun-lu̍t, sī Eng-gí parts per million ê thâu-jī-bó sio̍k-siá, eng lâi piáu-sī mi̍h-kiāⁿ koah 100 bān hūn liáu-āu, bó͘ te̍k-sû sêng-hun tī tang-tiong ê chiàm hūn, chú-iàu ēng lâi piáu-tat lông-tō͘.
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