# Parts-per notation/Related Articles

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*See also changes related to Parts-per notation, or pages that link to Parts-per notation or to this page or whose text contains "Parts-per notation".*

## Parent topics

- Chemistry [r]: The science of matter, or of the electrical or electrostatical interactions of matter.
^{[e]} - Engineering [r]: a branch of engineering that uses chemistry, biology, physics, and math to solve problems involving fuel, drugs, food, and many other products.
^{[e]} - Physics [r]: The study of forces and energies in space and time.
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## Subtopics

- Biology [r]: The science of life — of complex, self-organizing, information-processing systems living in the past, present or future.
^{[e]} - Chemical engineering [r]: a branch of engineering that uses chemistry, biology, physics, and math to solve problems involving fuel, drugs, food, and many other products
^{[e]} - Environmental engineering [r]: A field of engineering devoted to remediation of all forms of pollution.
^{[e]}

- Air pollutant concentrations [r]: Methods for conversion of air pollutant concentrations.
^{[e]} - Concentration [r]: In science, engineering and in general common usage: the measure of how much of a given substance there is in a given mixture of substances.
^{[e]} - Factor-label conversion of units [r]: A widely used method for converting one set of dimensional units to another set of equivalent units.
^{[e]} - Number [r]: One of the fundamental concepts of mathematics, used for such purposes as counting, ordering, and measuring.
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