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Mole

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Mole

Description

The mole [mol] is the SI base unit for the amount of substance of a system that contains 6.02214076ยท1023 specified elementary entities (see Avogadro constant). The elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.

Abbreviation: mol

Reference: Bureau International des Poids et Mesures 2019 The International System of Units (SI), Gnaiger MitoFit Preprints 2020.4

The redefined international system of units

SI-units.png
Since 2019-05-20, the definition of the mole is (from EURAMET):
The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6.022 140 76 ร— 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in the unit molโˆ’1 and is called the Avogadro number.
The amount of substance, symbol n, of a system is a measure of the number of specified elementary entities. An elementary entity may be an atom, a molecule, an ion, an electron, any other particle or specified group of particles.
From 1971 until 2019-05-20, the definition of the mole has been:
  1. The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilograms of carbon 12; its symbol is "mol".
  2. When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.
SI-units-elementary quantities.png
Quantity Symbol for quantity Q Symbol for dimension Name of abstract unit uQ Symbol for unit uQ [*]
elementary entity *,$ UX U elementary unit x
count *,$ NX = NยทUX X elementary unit x
amount of substance *,ยง nX = NXยทNA-1 N mole mol
charge *,โ‚ฌ Qel = zXยทeยทNX IยทT coulomb C = Aยทs
length l L meter m
mass m M kilogram kg
time t T second s
electric current I I ampere A
thermodynamic temperature T ฮ˜ kelvin K
luminous intensity Iv J candela cd
[*] SI units, except for the canonical 'elementary unit' [x]. The following footnotes are canonical comments, related to iconic symbols.
* For the elementary quantities NX, nX, and Qel, the entity-type X of the elementary entity UX has to be specified in the text and indicated by a subscript: nO2; Nce; Qel.
$ Count NX equals the number of elementary entities UX. In the SI, the quantity 'count' is explicitly considered as an exception: "Each of the seven base quantities used in the SI is regarded as having its own dimension. .. All other quantities, with the exception of counts, are derived quantities" (Bureau International des Poids et Mesures 2019 The International System of Units (SI)). An elementary entity UX is a material unit, it is not a count (UX is not a number of UX). NX has the dimension X of a count and UX has the dimension U of an elementary entity; both quantities have the same abstract unit, the 'elementary unit' [x].
ยง Amount nX is an elementary quantity, converting the elementary unit [x] into the SI base unit mole [mol] using the Avogadro constant NA.
โ‚ฌ Charge is a derived SI quantity. Charge is an elementary quantity, converting the elementary unit [x] into coulombs [C] using the elementary charge e, or converting moles [mol] into coulombs [C] using the Faraday constant F. zX is the charge number per elementary entity UX, which is a constant for any defined elementary entity UX. Qel = zXยทFยทnX


SI-units.png


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Entity, count, and number, and SI base quantities / SI base units
SI-units.png
Quantity name Symbol Unit name Symbol Comment
elementary UX elementary unit [x] UX, UB; [x] not in SI
count NX elementary unit [x] NX, NB; [x] not in SI
number N - dimensionless = NXยทUX-1
amount of substance nB mole [mol] nX, nB
electric current I ampere [A] A = Cยทs-1
time t second [s]
length l meter [m] SI: metre
mass m kilogram [kg]
thermodynamic temperature T kelvin [K]
luminous intensity IV candela [cd]
Fundamental relationships
ยป Avogadro constant NA
ยป Boltzmann constant k
ยป elementary charge e
ยป Faraday constant F
ยป gas constant R
ยป electrochemical constant f
SI and related concepts
ยป International System of Units
ยป elementary unit x
ยป SI prefixes
ยป International Union of Pure and Applied Chemistry, IUPAC
ยป entity
ยป quantity
ยป dimension
ยป format
ยป motive unit
ยป iconic symbols



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Bioblast links: Concentration and pressure - >>>>>>> - Click on [Expand] or [Collapse] - >>>>>>>
Concentration
ยป Volume
ยป Activity
ยป Concentration
ยป Density
ยป Mole
ยป Molar mass
Pressure
ยป Barometric pressure
ยป Chemiosmotic pressure
ยป Gas pressure
ยป Osmotic pressure
ยป Oxygen pressure
ยป pascal
ยป Pressure
Solubility = concentration/pressure
ยป Solubility
ยป Solubility factor
ยป Oxygen solubility
General
ยป Boltzmann constant
ยป Energy
ยป Force
ยป Gas constant
ยป Work
Related keyword lists
ยป Keywords: Oxygen signal
ยป Keywords: Normalization



MitoPedia concepts: Ergodynamics