molal (m), Molar (M)
molal (m), Molar (M) :
These notations, traditionally used by chemists to describe the concentration of chemical solutions, often appear to be units of measurement. It's easy to get them confused. The term "molal" describes the concentration of a solution in moles per kilogram of solvent (mol/kg), while "molar" describes a concentration in moles per liter (mol/L). A solution described as 1.0 M has a concentration of 1.0 mol/L. These units are not approved by the General Conference on Weights and Measures. Their use is declining, but still substantial
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