What does PH mean?

Potentital Hydrogen

Definition:

If you think back to high school chemistry class, you may recall that pH is an abbreviation for Potential Hydrogen. A pH number measures from 0 to14 how acidic or alkaline a liquid is -- anything above 7 is alkaline and anything below 7 is acid. Water has a pH level of 7 -- it's neutral, meaning it has the same amount of acids and alkalis, which balance each other out.