Volume percent can be expressed as volume per unit volume: The volume of carbon dioxide in one 1 m 3 of air can be calculated by modifying (1) to The concentration of carbon dioxide in air is aprox. = 8.345 pounds per million gallons of water Example - Volume Concentration of Carbon Dioxide in Air Weight of substance added to one unit volume of water to give one part per million (ppm) The concentration of a component can be measured as mass per unit volume - like mg/liter, mg/cm 3 etc. Weight percent = 100 m c / m s (2) ppm vs. ppq - parts per quadrillion (1 / 1,000,000,000,000,000 or 10 -15)Īn alternatively mass related unit to measure larger concentration levels is weight percent which can be expressed as.percent and mg/L chartĪlternatively - mass related units to measure very small concentration levels: In the metric system ppm for mass can be expressed in terms of milligram versus kg whereĭownload and print ppm vs. S = molar mass, volume or mass of solution (mole, m 3, ft 3, kg, lb m) ppm is defined asĬ = molar mass, volume or mass of component (mole, m 3, ft 3, kg, lb m) Parts per million is the molar mass, volume or mass ratio between the pollutant component and the solution. Parts per million - ppm - is commonly used as a dimensionless measure of small levels (concentrations) of pollutants in air, water, body fluids, etc.
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