PPM Definition (Parts Per Million)

Scientific Meaning

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Anne Marie Helmenstine, Ph.D.
Chemistry Expert
  • Ph.D., Biomedical Sciences, University of Tennessee at Knoxville
  • B.A., Physics and Mathematics, Hastings College
Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels.
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Anne Marie Helmenstine, Ph.D.
Updated 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%

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Helmenstine, Anne Marie, Ph.D. "PPM Definition (Parts Per Million)." ThoughtCo, Aug. 27, 2020, thoughtco.com/ppm-definition-606763. Helmenstine, Anne Marie, Ph.D. (2020, August 27). PPM Definition (Parts Per Million). Retrieved from https://www.thoughtco.com/ppm-definition-606763 Helmenstine, Anne Marie, Ph.D. "PPM Definition (Parts Per Million)." ThoughtCo. https://www.thoughtco.com/ppm-definition-606763 (accessed May 15, 2021).