- published: 10 Apr 2015
- views: 10237
In science and engineering, the parts-per notation is a set of pseudo units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are ppm (parts-per-million, 10−6), ppb (parts-per-billion, 10−9), ppt (parts-per-trillion, 10−12) and ppq (parts-per-quadrillion, 10−15).
Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water. The unit “1 ppm” can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of sample solution. When working with aqueous solutions, it is common to assume that the density of water is 1.00 g/mL. Therefore, it is common to equate 1 gram of water with 1 mL of water. Consequently, 1 ppm corresponds to 1 mg/L and ppb corresponds to 1 μg/L.
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In this video I will explain he concept of parts per million, apply it to the real world and work a few problems in which we calculate the ppm of a solution, etc.
Parts per million = mg/kg You can order free samples of bitrex from their web site. I did hehe.
The following video looks at calculating concentration of solutions. We will look at a Sample problem dealing with calculating ppm and ppb (Parts Per Million/Parts Per Billion). For more Senior Chemistry podcasts, search "Papapodcasts" on iTunes. Thanks for watching.
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This video explains how to do parts per million problems as well as what ppm is used for. Percent by mass and volume are also covered here.
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webpage-http://www.kentchemistry.com/links/Math/ppm.htm This short video shows you how to calculate parts per million for a solution. I discuss the equation, what a solution is , solute and solvent and I go over a really nasty NYS Regents Chemistry Exam question from 2007.
In this video I describe the basic thinking behind converting from ppmv of a gas to another common concentration unit mg per cubic meter. Created and produced by Dr. John Pollard, University of Arizona
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