Parts per Million (ppm)
Term | Main definition |
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Parts per Million (ppm) |
One of two common units of measurement for small concentrations of substances in another substance, the other being mg/m3. When the molecular mass of a substance is known, a threshold expressed in mg/m3 relatively easy to convert. In some science settings, mg/m3 is preferred, while almost all gas detection equipment's measurement values are expressed in ppm by default.
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