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Why can't Mathematica 9 simplify mol/L to M, when it can simplify M*L to mol?

 Quantity["Moles" / "Liters"] // UnitSimplify
 (* => 1 mol/L *)

 Quantity["Molar" * "Liters"] // UnitSimplify
 (* => 1 mol *)

And is there a way to fix this behaviour?

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3  
Perhaps this is because molar is not in the base SI system and mole is? –  Sjoerd C. de Vries Aug 21 '13 at 22:07
    
@Sjoerd: I'm not sure if the base vs non-base unit is the issue here. The example in the documentation is UnitSimplify[Quantity[1, ("Joules"/"Seconds")]] which yields the non-base SI Quantity[1, "Watts"]. –  Simon Oct 13 '13 at 12:12
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