英语词汇“parts per million”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	parts per million
释义	DictionarySeeppm parts per million parts per million The parts of a substance per million parts (by weight) of a solution; equal to 0.0001%. Abbr. ppm. parts per million parts per million (părts), PPM; ppm The concentration of a solute in a liquid or gas. For example, a pollutant such as soot may be said to be present in air at a level of 50 parts per million (parts of air). The units also may be expressed as weight of one substance to the weight of another or the volume of a fluid in the volume of another. See PPM See PPM
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parts per million