The pH of solutions (liquids) is measured.
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pH is a measure of the hydrogen ion (H+) activity in a solution.
We can use a pH paper.
pH is a measure of acidity or alkalinity of a solution.
Using a pH-meter the measurement is more accurate and sure.But at home you can use a pH-paper for transparent liquids.
The balance of pH, different areas of the body or water etc. require specific pHs. The pH scale measures acidity. pH 1-6 are acid, pH 7 is neutral and pH 8-14 are alkali.