pH

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pH,

range of numbers expressing the relative acidity or alkalinity of a solution. In general, pH values range from 0 to 14. The pH of a neutral solution, i.e., one which is neither acidic nor alkaline, is 7. Acidic solutions have pH values below 7; alkaline, or basic, solutions have pH values above 7. A pH value provides a measure of the hydrogen ion concentration of a solution. In pure water the concentration of hydrogen ions is equal to 0.0000001, or 10−7, moles per liter. (A mole is the amount of a substance, expressed in grams, that is equal to the molecular weight, or formula weight, of the substance.) When an acid is added to pure water, the hydrogen ion concentration increases above this level. When an alkaline substance, or base, is added to pure water, the hydrogen ion concentration decreases below this level. Once the concentration is determined, the pH value is found by taking the exponent used in expressing this concentration and reversing its sign. This is expressed as pH=−log10 [H+]. For example, if the hydrogen ion concentration of a solution is 10−4, or 0.0001, moles per liter, the pH is 4. See indicators, acid-baseindicators, acid-base,
organic compounds that, in aqueous solution, exhibit color changes indicative of the acidity or basicity of the solution. Common indicators include p-nitrophenol, which is colorless from pH 1 to 5 and yellow from p
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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

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

(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 ?
Hans Smola, Medical Director for Hartmann." When skin pH is reduced, the risk of LASD is also reduced."
Patients with AD will generally show elevated levels of skin pH, and a key element in managing the condition is normalizing pH.
Research findings show that the company's gloves helped participants maintain a lower skin pH and less dryness than the standard gloved hand.
Absorbent Article Which Maintains Prolonged Natural Skin pH: No.
A study that looked at the effects of emollients on infants with atopic dermatitis showed that the emollient group has a lower skin pH and a more diverse microbiome.
Part 2 of the study demonstrates that the use of bar soap on normal, nonatopic skin causes a significant increase in skin pH and chymotrypsin-like protease activity as compared to the use of a mild synthetic cleanser.
These include keeping the skin pH sufficiently acidic, using topical antihistamines (particularly [H.sub.2]-blockers such as cimetidine), and applying appropriately formulated physiologic lipid amines.
Initial cleansers for newborns should be recommended that are not drying and that will not disrupt the skin pH and the normal development of the acid mantle, perturb the development of the microbiome, or remove the outermost layers of epidermal cells.
These include keeping the skin pH sufficiently acidic, using topical anti-histamines (particularly [H.sub.2]-blockers such as cimetidine), and applying appropriately formulated physiologic lipid amines.
Children in the control arm showed favorable albeit nonsignificant trends for less transepidermal water loss and a lower skin pH.