| parts per million |
An amount of error proportional to the distance measured. For example, an error of +/- 3 millimeters for a measurement of 30 meters means that the measurement is good only to 100 ppm.
출처: www.geography.wisc.edu/sco/references/glossary.htm...
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| parts per million |
ABBR: PPM; ppm. The concentration of a solute in a liquid gas. For example, a pollutant such as soot may be said to be present in air at a level of 50 parts per million (parts of air). The units also may be expressed as weight
출처:
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| parts per million |
the number of grams of solute in a million grams of solution, or the number of mg. of solute in 1000 g or 1 L of solution. The most convenient units are mg/L.
출처: www.unco.edu/chemquest/b_gloss.htm
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| parts per million |
this is sort of a generic unit of measure in the sence that it can represent a lot different units of measure (eg mg/L, ug/ml, mg/Kg, lb/acre), therefore a ppm equals one part of something per million parts of something else. So if you have water quality data in mg/L, that data is equivalent to ppm (ie 50mg Calcium/L = 50 mg Calcium/1,000,000 mg water/L = 50 ppm Calcium). By the way, if you have soil test data in parts per million you can convert that to lb/Acre by multiplying by 2. ...
출처: wyagric.state.wy.us/aslab/wmterms.htm
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| parts per million |
Parts per million works like percent by mass, but is more convenient when there is only a small amount of solute present. PPM is defined as the mass of the component in solution divided by the total mass of the solution multiplied by 10 6 (one million): A solution with a concentration of 1 ppm has 1 gram of substance for every million grams of solution. ...
출처: www.ilpi.com/msds/ref/concentration.html
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