Parts per trillion (ppt) is a measure of concentration that is used where very low levels of concentration are significant. The ppt value is equivalent to the absolute fractional amount multiplied by one trillion (1012). Concentration is a very common concept used in chemistry and related fields. ... The numeral trillion refers to one of two number values, depending on the context of where and how it is being used. ...
A percentage is a way of expressing a proportion, a ratio or a fraction as a whole number, by using 100 as the denominator. ... A permille or per mille is a tenth of a percent or one part per thousand. ... Parts per million (ppm) is a measure of concentration that is used where low levels of concentration are significant. ...
Partsper million (ppm), partsper billion (ppb), and partspertrillion (ppt), are the most commonly used terms to describe very small amounts of contaminants in our environment.
One partper billion is the equivalent of one drop of impurity in 500 barrels of water.
A milligram is one partper million of a kilogram thus, one partper million (ppm) is the same as one milligram per kilogram.
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