| ppm |
The abbreviation ppm stands for parts per million. It is a common unit of concentration of gases or vapour in air. For example, 1 ppm of a gas means that 1 unit of the gas is present for every 1 million units of air. One ppm is the same as 1 minute in 2 years or 1 cent in $10,000.
출처: ccinfoweb.ccohs.ca/help/msds/msdstermse.html
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| ppm |
Abbreviation for parts per million. Used in chemical determinations as one part per million parts by weight.
출처: www.cleaver-brooks.com/GlossFP.html
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| ppm |
The number of "parts" by weight of a substance per million parts of water. This unit is commonly used to represent pollutant concentrations. Large concentrations are expressed in percentages.
출처: www.ec.gc.ca/water/en/info/gloss/e_gloss.htm
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| ppm |
Parts Per Million. Refers to the concentration of a substance in a sample. For example, a concentration of five parts per million (5 ppm) of benzene means there are five molecules of benzene present in the sample for every 999,995 molecules of other substances. The metric equivalents are:
출처: www.deq.state.or.us/wmc/cleanup/glossary.htm
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| ppm |
A volume unit of measurement; the number of parts of a substance in a million parts of another substance. For example, 10 ppm nitrate in water means 10 parts of nitrate in a million parts of water.
출처: www.soil.ncsu.edu/publications/BMPs/glossary.html
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