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   pH

   /ˌpiːˈeɪtʃ/

   noun

   • 1. a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline. The pH is equal to −log10 c, where c is the hydrogen ion concentration in moles per litre.

   Word Origin early 20th century: from p representing German Potenz ‘power’ + H2, the symbol for hydrogen.

   Scrabble Points: 7

   • P

     3

   • H

     4

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