Mmolar

Mmolar is a nonstandard term occasionally seen in informal writings or certain datasets to denote a concentration unit of one thousandth of a mole per liter, effectively the millimolar concentration. In formal chemical nomenclature, the correct notation is millimolar, abbreviated as mM, or equivalently millimoles per liter (mmol/L). The capitalization of Mmolar is ambiguous because M represents molar (mol/L) and m represents the prefix for milli (10^-3), which can lead to confusion. As a result, Mmolar is discouraged in formal contexts.

Definition and equivalence: 1 Mmolar is intended to equal 1 × 10^-3 M, i.e., 0.001 moles per liter, which is the same as 1 millimolar (1 mM). In precise writing, the preferred form is 1 mM or 1 mmol/L.

Usage and conventions: In most scientific literature, concentrations are written as mM or mmol/L. The use of Mmolar can create ambiguity, especially in mixed documents or databases where capitalization matters. Some software tools or datasets may adopt Mmolar as a label, but this is not standardized.

Applications: Mmolar/millimolar concentrations are common in biochemistry, physiology, pharmacology, and cell biology to describe substrate, drug, or ionic concentrations. Typical experimental ranges span from sub-micromolar to millimolar levels.

Example: A solution of 0.5 mM contains 0.0005 moles of solute per liter, equivalent to 0.5 mmol/L.

See also: Molarity, Millimolar, Molar, Concentration units.