So you can now understand what is a part per million. ppm in this context probably means parts per million. This is the concentration of a chemical or element in something like food or drink. for example 8 milligrams of mercury in 100 grams of fish would result in a mercury concentration of 0.8 ppm (parts per million)
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The collective effect is to set up a conveyer type motion with fluid rising in the center above the heated region, moving outward at the surface then down the sides. The overall effect is a circulation of material in two relatively simple cells, as illustrated in the cartoon below.