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1. parts per million.
2. pulses per minute.
Abbreviation for parts per million.
ppmparts per million.
abbreviation for parts per million.
1. Parts per million.
2. Pulse per minute.
abbreviation for parts per million; a weight-for-weight (w/w) concentration equal to 1 mg/kg or 1 g/tonne. Used most commonly to express the concentration of toxicants or trace elements in water, feeds, solvents and tissues.