For Parts Per Million (PPM) we have terms and definitions in 4 topics. The topics are Air Quality, Physical Geography, Real Estate and Sanitation.

Parts Per Million (Ppm) (Air Quality)

The number of parts of a given pollutant in a million parts of air

Parts Per Million (Ppm) (Physical Geography)

Number of parts of a substance found in one million parts of a particular gas, liquid, or solid.

Parts Per Million (Ppm) (Real Estate)

Units commonly used to express contamination ratios, as in establishing the maximum permissible amount of a contaminant in water, land, or air. These ratios can also be expressed in "parts per billion (ppb)."

Parts Per Million (Ppm) (Sanitation)

The number of weight or volume units of a minor constituent present with each one million units of a solution or mixture. In water-related issues the more specific term milligrams per liter (mg/L) is preferred. In air-related issues the more specific term milligrams per litervolume (mg/Lv) is preferred.

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