Ph
Uses phonetical concepts and photographs to teach children reading skills, focusing on the letter combination ph.

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1. The tool for looking up people in Eudora on the Macintosh. Equivalent to Unix's finger service.

2. Parallel Haskell

3. The country code for the Philippines.

1. System of measuring the acidity or alkalinity of a substance; refers to the negative logarithm of the hydrogen ion content of the solution.

   pH values run from 1 to 14; a pH of 7 indicates that a substance is neutral. A value of more than 7 indicates the substance is basic (alkaline) and a value of 11 or more indicates it is very basic and is likely to cause corrosion and/or tissue damage. Likewise, a value of less than 7 indicates that the substance is acidic, and a value of 3 or less indicates it is a strong acid.

2. A measure of the hydrogen-ion activity in a solution, expressed as the negative log10 of hydrogen ion concentration on a scale of 0 (highly acidic) to 14 (highly basic) with a pH of 7 being neutral.