In cases of some liquids, if some substance is dissolved in it, it is denoted by” ppmw” or “ppm,” indicating a weight of dissolved substance in its one million weight. In cases of some liquids, “ppmv” is also used meaning a certain volume of a substance dissolved in one million parts per volume of liquid. In science and engineering, “ppm” describes fractions of mass in chemistry, it describes the relative presence of dissolved substances in water while in physics and engineering, expansion of a metal alloy in length with respect it its total length can be quoted as “quantity per quantity.” They all are numbers and not concerned with any kind of units of measurements.Īccording to its abbreviation “ppmv” stands for “parts per million volume.” Trace gases found in the atmosphere such as sulphur dioxide, carbon dioxide, nitrogen, and other pollutants in the air are denoted by “ppmv” that is, parts per million by volume. In various fields, such as chemistry, physics, and engineering, “ppm” is the unit to describe no- dimensional quantities as parts per notation. Traces of contaminants and food additives are also usually described in this manner. This is a form which describes small concentrations. It describes parts per million of any quantity by weight. While using these terms one should be very specific and not be confused in using one in place of the other. Both “ppm” and “ppmv” are abbreviations used in scientific calculations.
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