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What does PPM stand for?

PPM stands for Parts Per Million

This definition appears very frequently

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We have 379 other meanings of PPM in our Acronym Attic

Samples in periodicals archive:

000014 grams per gram, fourteen parts per million, one 714th of a percent, or fourteen ten-thousandths of a percent, but not one fourteen thousandths of a percent.
015 parts per million, Green's Assistant Deputy Advocate for Research and Investigation, Suzanne Mattei, says most people can't even smell perc until it reaches four or five parts per million.
4 defective parts per million is a realistic goal--provided that it is approached deliberately and with the full cooperation of your customer and toolmaker.