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The demal (D) is an obsolete unit for expressing the concentration of a solution . It is equal to molar concentration at 0 °C, ., 1 D represents one mole of the solute present in one cubic decimeter of the solution at 0 °C.  It was first proposed in 1924 as a unit of concentration based on the decimeter rather than the liter; at the time there was a factor of difference between the liter and the cubic decimeter.  The demal was used as a unit of concentration in electrolytic conductivity primary standards.  These standards were later redefined in terms of molar concentration.