Top Definition
The pH scale (always written with a small p and a capital H) is the scale used to determine how acidic or alkaline a substance is.

It goes from 1 to 14. 1 being very acidic, and 14 being very alkaline. 7 is neutral.
Dude! Did you see that corrosive acid! It must have been 1 on the pH scale!
by Science dewd April 04, 2010

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