parts per million (PPM)

Related Terms
Concentration by volume of one part of a gas (or vapor), or by weight of a liquid or solid, per million parts of air or liquid. One ppm is roughly equivalent to 5 liters of material in an Olympic-size swimming pool.

Use 'parts per million (PPM)' in a Sentence

We had determined that the pseudo science suggested by the company was irrelevant because the parts per million was negligible.
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You need to be able to calculate the parts per million in your factory and make sure they are at reasonable levels.
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You must always know what the parts per million of any toxic substance are so that all of your workers are safe.
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