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Noun ph scale has 1 sense
- pH, pH scale - (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 greater than 7 is acidic and less than 7 is basic)
--1 is a kind of hydrogen ion concentration
--1 has particulars: acidity; alkalinity; neutrality
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