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.
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?
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 iuPS800.
