![]() Similarly, parts-per notation is used also in physics and engineering to express the value of various proportional phenomena. Consequently, 1 ppm corresponds to 1 mg/L and 1 ppb corresponds to 1 μg/L. Therefore, it is common to equate 1 kilogram of water with 1 L of water. When working with aqueous solutions, it is common to assume that the density of water is 1.00 g/mL. The quantity "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. Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water. This notation is not part of the International System of Units (SI) system and its meaning is ambiguous. Commonly used are parts-per-million ( ppm, 10 −6), parts-per-billion ( ppb, 10 −9), parts-per-trillion ( ppt, 10 −12) and parts-per-quadrillion ( ppq, 10 −15). Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. ![]() In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. As the concentration increases the colour becomes a more vibrant yellow, then orange, with the final 10,000 ppm a deep red colour. At 1 ppm the solution is a very pale yellow. Fluorescein aqueous solutions, diluted from 10,000 to 1 parts-per-million in intervals of 10 fold dilution.
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