pH

pH

potential of hydrogen; a measure of the acidity or alkalinity of a solution equal to the common logarithm of the reciprocal of the concentration of hydrogen ions in moles per cubic decimetre of solution. Pure water has a pH of 7, acid solutions have a pH less than 7, and alkaline solutions a pH greater than 7

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

pH

[pē′āch]

(chemistry)

A term used to describe the hydrogen-ion activity of a system; it is equal to -log a_H⁺; here a_H⁺is the activity of the hydrogen ion; in dilute solution, activity is essentially equal to concentration and pH is defined as -log₁₀[H⁺], where H⁺is hydrogen-ion concentration in moles per liter; a solution of pH 0 to 7 is acid, pH of 7 is neutral, pH over 7 to 14 is alkaline.

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pH(S)

(analytical chemistry)

pH standard

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

pH

A measure of the acidity or alkalinity of a solution; numerically equal to 7.0 for a neutral solution; the pH value increases with increasing alkalinity and decreases with increasing acidity. Also See pH value.

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PH

1. On drawings, abbr. for phase.

2. Abbr. for phillips head.

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phot

A unit of illumination equal to 1 lumen per square centimeter. Abbr. ph.

McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

PH

(tool)

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

pH

(2)

Parallel Haskell

ph

(networking)

The country code for the Philippines.

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)