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Parts per million (PPM)
These terms give scientists a way to describe how much of a substance is contained in a sample: parts of analyte per million parts of sample, for instance. In atmospheric chemistry these become volume parts of analyte per volume parts of atmosphere: ppmv, ppbv, etc. At low analyte gas phase concentrations the analyte is assumed to act as an ideal gas. For instance, a 1 ppmv concentration of formaldehyde would represent 1 litre of formaldehyde per every 1,000,000 litres of air; also equivalent to 1 microliter of H2CO per 1 L air. In gas phase concentrations these units are also called gas phase mixing ratios. The reason is because they are just that, ratios of analyte volume to sample volume; the volume of the sample doesn't matter.
- Part of Speech: noun
- Synonym(s):
- Blossary:
- Industry/Domain: Chemistry; Weather
- Category: Atmospheric chemistry
- Educational Institution: Sam Houston State University
- Product:
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