What does pH scale mean?
• PH SCALE (noun) The noun PH SCALE has 1 sense: 1. (from potential of Hydrogen) 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 more basic and less than 7 is more acidic) Familiarity information: PH SCALE used as a noun is very rare.