Editing Molar concentration (section)

==Units==
In the [[International System of Units]] (SI), the [[Coherence (units of measurement)|coherent unit]] for molar concentration is [[Mole (unit)|mol]]/[[Metre|m]]<sup>3</sup>. However, most chemical literature traditionally uses [[Mole (unit)|mol]]/[[Decimetre|dm]]<sup>3</sup>, which is the same as [[Mole (unit)|mol]]/[[Litre|L]]. This traditional unit is often called a '''molar''' and denoted by the letter M, for example:
:1 [[Mole (unit)|mol]]/[[Metre|m]]<sup>3</sup> = 10<sup>−3</sup> [[Mole (unit)|mol]]/[[Decimetre|dm]]<sup>3</sup> = 10<sup>−3</sup> [[Mole (unit)|mol]]/[[Litre|L]] = 10<sup>−3</sup>&nbsp;M = 1&nbsp;mM = 1&nbsp;mmol/L.

The [[SI prefix]] "[[Mega-|mega]]" (symbol M) has the same symbol. However, the prefix is never used alone, so "M" unambiguously denotes molar.
Sub-multiples, such as "millimolar" (mM) and "nanomolar" (nM), consist of the unit preceded by an [[SI prefix]]:

{| class="wikitable" style="text-align:center;" border="0"
|-
! rowspan=2 | Name
! rowspan=2 | Abbreviation
! colspan=2 | Concentration
|-
! (mol/L)
! (mol/m<sup>3</sup>)
|-
|{{anchor|millimolar}}millimolar
|mM
|10<sup>−3</sup>
|10<sup>0</sup>=1
|-
|micromolar
|μM
|10<sup>−6</sup>
|10<sup>−3</sup>
|-
|nanomolar
|nM
|10<sup>−9</sup>
|10<sup>−6</sup>
|-
|picomolar
|pM
|10<sup>−12</sup>
|10<sup>−9</sup>
|-
|femtomolar
|fM
|10<sup>−15</sup>
|10<sup>−12</sup>
|-
|attomolar
|aM
|10<sup>−18</sup>
|10<sup>−15</sup>
|-
|zeptomolar
|zM
|10<sup>−21</sup>
|10<sup>−18</sup>
|-
|yoctomolar
|yM
|10<sup>−24</sup><br />(6 particles per 10 L)
|10<sup>−21</sup>
|-
|rontomolar
|rM
|10<sup>−27</sup>
|10<sup>−24</sup>
|-
|quectomolar
|qM
|10<sup>−30</sup>
|10<sup>−27</sup>
|}