#hydrogen_ion_concentration  the number of moles of hydrogen ions per cubic decimeter
  supertype:  #concentration  the strength of a solution; number of molecules of a substance in a given volume (expressed as moles/cubic meter)
  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

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