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Molar concentration or molarity is most commonly expressed in units of moles of solute per litre of solution. [2] For use in broader applications, it is defined as amount of substance of solute per unit volume of solution, or per unit volume available to the species, represented by lowercase : [3]
List of orders of magnitude for molar concentration; Factor (Molarity) SI prefix Value Item 10 −24: yM 1.66 yM: 1 elementary entity per litre [1]: 8.5 yM: airborne bacteria in the upper troposphere (5100/m 3) [2]
Greenhouse and growth chamber lighting for plants is sometimes expressed in micromoles per square metre per second, where 1 mol photons ≈ 6.02 × 10 23 photons. [7] The obsolete unit einstein is variously defined as the energy in one mole of photons and also as simply one mole of photons.
In Unicode, the symbol is represented by U+03BC μ GREEK SMALL LETTER MU or the legacy symbol U+00B5 µ MICRO SIGN. The prefix "mc" is commonly used in healthcare or when the character "μ" is not available; for example, "mcg" commonly denotes a microgram. [3] The letter "u" is sometimes used instead of "μ" when non-Latin characters are not ...
The standard SI unit of this quantity is mol/m 3, although more practical units are commonly used, such as mole per liter (mol/L, equivalent to mol/dm 3). For example, the amount concentration of sodium chloride in ocean water is typically about 0.599 mol/L. The denominator is the volume of the solution, not of the solvent. Thus, for example ...
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The SI unit is the katal, 1 katal = 1 mol s −1 (mole per second), but this is an excessively large unit. A more practical and commonly used value is enzyme unit (U) = 1 μmol min −1 (micromole per minute). 1 U corresponds to 16.67 nanokatals. [1]
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