#acidity  pH values below 7
  exclusion:  #alkalinity
  supertype:  #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:  #hyperacidity  excessive acidity

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