pH, technically, is unitless due to its logarithmic nature. However, some prefer to say that pH 14.0 is '14 pH units'.
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pH is expressed in units of 0 to 14, representing the concentration of hydrogen ions in a solution. A pH of 7 is considered neutral, below 7 is acidic, and above 7 is basic. The lower the pH, the more acidic the solution, and the higher the pH, the more basic.
Angular Measure
Everything measureable has a unit it is measured in.
Mass is expressed in grams in the SI system and slugs in the English system. (these are the base units obviously multiples of these units exist. ex: kg). Volume is expressed as a cubic of any unit of length ex: M^3.
The acidity or basicity are expressed by pH (the negative logarithm of the activity of hydronium ion).
The pH scale is logarithmic; the difference between two units is x10.