In chemistry, the unit of molality, or concentration of amount per unit mass.

One molal = 1 mole per kilogram.

The word molal does not have a separate symbol, so
1 molal = 1 mol/kg
However, m may be used for molality, and so in effect as a symbol for molal.

Also used as the adjective in talking about molal concentration. This is opposed to molar concentration, which is amount per unit volume.

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