1. [ 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)
Synonyms: pH_scale
Related terms: hydrogen_ion_concentration acidity alkalinity neutrality chemistry
Similar spelling:   Phy