PPM or Parts Per Million is a unit used to describe very small concentrations of a substance in a larger solution. PPM means 1 per every 1,000,000 or 1/1,000,000. What is PPM in Science?
Parts per million (ppm) is a commonly used unit of concentration for small values. One part per million is one part of solute per one million parts solvent or 10 -6. Parts per million and other "parts per" notations (e.g., parts per billion or parts per trillion) are dimensionless quantities with no units.

Meaning of ppm in English. ppm. noun [ U ] uk / ˌpiː.piːˈem / us / ˌpiː.piːˈem /. Add to word list Add to word list. abbreviation for parts per million (= a unit for measuring the amount of a substance that is mixed with a liquid or another substance)

Scientific Meaning Martin Leigh / Getty Images By Anne Marie Helmenstine, Ph.D. Updated on March 25, 2019 PPM Definition: PPM stands for parts per million. It is commonly used to express concentration and temperature coefficients. Also Known As: parts per million Examples: 100 ppm is identical to 0.01% Cite this Article
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