#concentration  the strength of a solution; number of molecules of a substance in a given volume (expressed as moles/cubic meter)
  supertype:  #property.attribute  a basic or essential attribute shared by all members of a class; "a study of the physical properties of atomic particles"
  subtype:  #titer__titre  the concentration of a solution as determined by titration
  subtype:  #hydrogen_ion_concentration  the number of moles of hydrogen ions per cubic decimeter
     subtype:  #pH_scale__pH__ph  (chemistry) p(otential of) H(ydrogen); the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and <7 is acidic and >7 is basic)
        subtype:  #acidity  pH values below 7
           subtype:  #hyperacidity  excessive acidity
        subtype:  #alkalinity  pH values above 7
        subtype:  #neutrality.pH_scale  pH value of 7
  subtype:  #molality  molal concentration
  subtype:  #molarity__molar_concentration__molarconcentration__M  concentration measured by the number of moles of solute per liter of solvent

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