measure of acidity or alkalinity of solution

См. также в других словарях:

• pH — Symbol for the negative decadic logarithm of the H+ ion concentration (measured in moles per liter); a solution with pH 7.00 (1 × 10−7 g molecular weight of hydrogen per liter) is neutral at 22°C ( i.e., [H+] = [OH− …   Medical dictionary

• Ph — Symbol for phenyl. * * * Pallister Hall [syndrome]; papillary hyperplasia; parathyroid hormone; partial hepatectomy; partial hysterectomy; passive hemagglutination; past history; patient s history; persistent hepatitis; personal history;… …   Medical dictionary

• plant disease — ▪ plant pathology Introduction       an impairment of the normal state of a plant that interrupts or modifies its vital functions.       All species of plants, wild and cultivated alike, are subject to disease. Although each species is… …   Universalium

• pH — noun Etymology: German, from Potenz power + H (symbol for hydrogen) Date: 1909 a measure of acidity and alkalinity of a solution that is a number on a scale on which a value of 7 represents neutrality and lower numbers indicate increasing acidity …   New Collegiate Dictionary

• pH meter — ▪ instrument       electric device used to measure hydrogen ion activity (acidity or alkalinity) in solution. Fundamentally, a pH meter consists of a voltmeter attached to a pH responsive electrode and a reference (unvarying) electrode. The pH… …   Universalium

• acid–base reaction — ▪ chemistry Introduction       a type of chemical process typified by the exchange of one or more hydrogen ions, H+, between species that may be neutral (molecules, such as water, H2O; or acetic acid, CH3CO2H) or electrically charged (ions, such… …   Universalium

• pH — For other uses, see PH (disambiguation). Acids and Bases Acid dissociation constant Acid base extraction Acid–base reaction Acid–base titration Dissociation c …   Wikipedia

• PH — is the measure of the acidity or alkalinity of a solution. It is formally a measure of the activity of dissolved hydrogen ions (H+), but for very dilute solutions, the molarity (molar concentration) of H+ may be used as a substitute with little… …   Wikipedia

• Base (chemistry) — For the term in genetics, see base (genetics) Acids and Bases Acid dissociation constant Acid base extraction Acid–base reaction Acid–base titration …   Wikipedia

• pH — Chem. the symbol for the logarithm of the reciprocal of hydrogen ion concentration in gram atoms per liter, used to express the acidity or alkalinity of a solution on a scale of 0 to 14, where less than 7 represents acidity, 7 neutrality, and… …   Universalium

• biosphere — biospheric /buy euh sfer ik/, adj. /buy euh sfear /, n. 1. the part of the earth s crust, waters, and atmosphere that supports life. 2. the ecosystem comprising the entire earth and the living organisms that inhabit it. [1895 1900; < G Biosphäre; …   Universalium