Definitions for "PH scale"
Chemical table of alkalinity and acidity ranging from 0 to 14. Less than 7 indicates acidity; 7 is neutral; more than 7 is alkaline.
A scale from 0 to 14 reflecting the concentration of hydrogen ions in solution; the lower numbers denote acidic conditions and the upper numbers denote basic, or alkaline, conditions.
The strength of acids and bases. Pure water has a pH value of 7, acids have a lower value and bases higher.