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Questions and Answers
What is the concentration unit for atmospheric pollutants expressed as parts per million by volume?
What is the concentration unit for atmospheric pollutants expressed as parts per million by volume?
- %(v/v) or % (mol/mol)
- ppm(1 in 10^6) (correct)
- ppb(1 in 10^9)
- ppt(1 in 10^12)
What does 1 ppmv (parts per million by volume) represent?
What does 1 ppmv (parts per million by volume) represent?
- 1 volume of gaseous pollutant/10^6 volumes of air (correct)
- 1 vol pollutant/10^12 volumes of air
- 10-4 % by volume
- 1 vol pollutant/10^9 volumes of air
What is the equivalent concentration unit for 1 ppb (parts per billion) in micrograms per cubic meter at 25ËšC and 1 atm?
What is the equivalent concentration unit for 1 ppb (parts per billion) in micrograms per cubic meter at 25ËšC and 1 atm?
- 2.46*10^13 molecules/cm3
- 1 volume of gaseous pollutant/10^9 volumes of air
- μg of a pollutant / m3 of air
- 40.9 M μg/m3 (correct)
Which concentration unit is expressed as parts per trillion?
Which concentration unit is expressed as parts per trillion?
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What relationship exists between 1 ppm and 103 ppb?
What relationship exists between 1 ppm and 103 ppb?
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