+The pH scale measures the [acidity](/wiki/acidity) or [alkalinity](/wiki/alkalinity) of an aqueous solution, ranging from 0 to 14. A value of 7 signifies [neutral](/wiki/neutral), while lower numbers indicate increasing acidity and higher numbers denote alkalinity.
+## See also
+- [Acid](/wiki/acid)
+- [Base](/wiki/base)
+- [Water](/wiki/water)
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