- A measure of the acidity or alkalinity of a solution. For an aqueous solution it can be expressed as pH = log10 (1/H+), where H+ is the hydrogen-ion concentration. A pH of 7 is defined as neutral, below 7 is acidic, and above 7 is basic, or alkaline. It is an abbreviation of potential for hydrogen. Also called pH value.
- abbreviation for pi-cohenry
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