Unit of measurement based on number of particles.
1 However, the precisions demonstrated so far have been lower than one part per million .
2 Unfortunately he was also Swiss, which diluted the fervency thing to some minuscule part per million .
3 Public drinking water in a concentration of one part per million can reduce dental decay by over 65 per cent.
4 The concentration would change from one part per million at one minute to half a part per million at two minutes.
5 Fluoridation, implemented as a means of reducing tooth decay, involves adding one part per million of fluoride to the water supply.
6 Experiments showed that adding fluoride to drinking water at a concentration of one part per million can reduce dental decay by over 65 per cent.
7 Jim's voice said, They took air samples, measured in parts per million .
8 And just how many parts per million carbon dioxide are too many?
9 The United States allows 10 parts per million of DPA residues in food.
10 Atmospheric carbon dioxide has not dropped below 250 parts per million .
11 Sometimes the data were reported in percentages and sometimes in parts per million .
12 Transneft allows no more than 10 parts per million (ppm) of organic chlorides.
13 That corresponds to a rise in atmospheric carbon to 430 parts per million , or ppm.
14 He did not see things in parts per million .
15 Carbon dioxide now sits at 400 parts per million .
16 Many types of fish struggle or die when oxygen is below 5 parts per million .
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