| 释义 |
ppm
noun[ U ]
uk /ˌpiː.piːˈem/ us /ˌpiː.piːˈem/
abbreviation for parts per million (= a unit for measuring the amount of a substance that is mixed with a liquid or another substance)百万分之…(衡量物质与液体或其他物质混合时的度量单位，parts per million的缩写）
SMART Vocabulary: related words and phrases
Miscellaneous units of measurement
acre
acreage
caloric
dioptre
farad
fathom
firkin
flashpoint
hectare
joule
MHz
newton
refractive index
röntgen
Scoville scale
SI unit
sievert
sun protection factor
torr
watt
ppm | American Dictionary
ppm
noun[ U ]
chemistry
abbreviation for parts per million (= a unit for measuring the amount of a substance that is mixed with a liquid or another substance)
ppm | Business English
ppm
noun[ plural ]
MEASURESukus
abbreviation for parts per million: the amount of a chemical in relation to the substance that contains it:
Lead levels in the water were above 3,500 ppm.
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