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Questions and Answers
Which unit is used to express the concentration of substances in air as parts per system scale?
Which unit is used to express the concentration of substances in air as parts per system scale?
- %(v/v) or % (mol/mol) (correct)
- ppb(1 in 10^9)
- ppt(1 in 10^12)
- ppm(1 in 10^6)
What does a concentration of 2 ppm of any pollutant gas in air mean?
What does a concentration of 2 ppm of any pollutant gas in air mean?
- 2 liters of the pollutant(P) in 1 million liters of air
- 2 moles of the pollutant(P) in 10^6 moles in air
- 2 milliliters of the pollutant(P) in 1 cubic meter of air
- 2 molecules of the pollutant(P) in 10^6 molecules in air (correct)
What is the definition of 1 ppmv (parts per million by volume)?
What is the definition of 1 ppmv (parts per million by volume)?
- 1 milliliter of gaseous pollutant in 10^6 milliliters of air
- 1 mole of gaseous pollutant in 10^6 moles of air
- 1 volume of gaseous pollutant in 10^6 volumes of air (correct)
- 1 liter of gaseous pollutant in 10^6 liters of air
What is the relationship between 1 ppm and μg/m3 at 25˚C and 1 atm?
What is the relationship between 1 ppm and μg/m3 at 25˚C and 1 atm?
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What is the reminder relationship between ppm, ppb, and ppt?
What is the reminder relationship between ppm, ppb, and ppt?
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