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"physcal" is probably misspelled. Trying pH_scale instead Definition of pH_scale
pH_scale has definitions from the field of chemistry |
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[ noun ] (chemistry) p(otential of) H(ydrogen); the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure of the acidity or alkalinity of a solution (where 7 is neutral and <7 is acidic and >7 is basic)
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