Parts per Million (ppm)

Term Main definition
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.


7Solutions has its own service and maintenance department where we can service any gas detection instrument, no matter what brand or age.

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