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Typically, conversions for chemicals in air are made assuming a pressure of 1 atmosphere and a temperature ofĬonvert from concentration in parts per million to concentration in milligrams per cubic meter (mg/m3Ĭoncentration (ppm) = 24. In order to convert between partial pressure (P) and concentration (M), we need to manipulate this equation to get our desired answer, and must be provided with the value of the temperature at which the rxn takes place. Also, atmospheric temperature and pressure affect the calculation. Like the post above states, we do have to use the equation of the ideal gas law, PVnRT, where Ppressure in atm, Vvolume in L, nmoles of substance, Rideal gas constant, and Ttemperature in Kelvin. Is based on the molecular weight of the chemical and isĭifferent for each chemical. Nanograms, or picograms) per volume of air (cubic meterĮxpressed as parts per million (ppm) or parts per billion In units of the mass of chemical (milligrams, micrograms, Therefore, 350 ppm CO2 means that for every million molecules of a fluid, there are 350 molecules of CO2.Ĭoncentrations of chemicals in air are typically measured The unit parts per million refers to the unit molecules.
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