pH

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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

pH

[pē′āch]
(chemistry)
A term used to describe the hydrogen-ion activity of a system; it is equal to -log aH+; here aH+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.

pH(S)

(analytical chemistry)

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.

PH

1. On drawings, abbr. for phase.
2. Abbr. for phillips head.

phot

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

PH

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

pH

(2)

ph

(networking)
The country code for the Philippines.
References in periodicals archive ?
As carbon dioxide levels have risen, the average pH level in the ocean, an indicator of acidity, has dropped (on the pH scale, a lower number means more acidity).
Which number on the pH scale indicates neutral acidity and alkalinity?
Sulfate is especially useful in Southern California soil, which is on the alkaline side of the pH scale, since it has an acidifying effect.
Scientists measure acidity on what's called the pH scale.
Since the pH scale is based on logarithms, a small shift in the numbers on your pH computer reflects a big difference in your soil.
The pH scale measures how acidic or basic a substance is.
The DolpHin Series sensors are designed for process industry applications that span the entire pH scale, have strong chemical concentrations and high solids, run at high temperature, and cycle from high to low temperature.