pH stands for "potential of hydrogen" or "presence of hydrogen ions".
The pH is a measure that ranges from 0 to 14.
pH is measured with a pH meter or with pH paper (or pH indicator paper).
A liquid is:
- acidic if its pH is between 0 and 7 (0 < pH < 7),
- neutral if its pH is equal to 7, and
- basic if its pH is between 7 and 14 (7 < pH < 14).
A liquid with a pH close to 0 is highly acidic.
A liquid with a pH close to 14 is highly basic.
Highly acidic and highly basic solutions are corrosive and dangerous.
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