Units of Amount of Substance
Amount of substance is a base dimension in the International System of Units. The SI unit of amount of substance is the mole, which is defined as an amount of a substance that contains as many elementary entities as there are atoms in 12 grams of carbon-12 (14th CGPM, 1971).
When the mole is used, the elementary entities must be specified: atoms, molecules, ions, electrons, other particles, or any specified group of particles. In the Units package, use modifiers and/or attachments in parentheses to indicate the entities.
Maple knows the units of amount of substance listed in the following table.
An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively. Refer to a unit in the Units package by indexing the name or symbol with the context, for example, mole[SI] or mol[SI]; or, if the context is indicated as the default, by using only the unit name or symbol, for example, mole or mol.
The unit of amount of substance is defined as follows.
A mole is defined as approximately 6.0221367×1023 elementary entities.
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