Quantitative Concept
hydrogen-ion concentration
Definitions related to hydrogen-ion concentration:
  • (ph) Quantity of dimension one used to express on a scale from 0 to 14 the amount-of-substance concentration of hydrogen ion of dilute aqueous solution, calculated as the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
  • (ph) The negative logarithm (base 10) of the concentration of hydronium ions, which is used as a measure of the acidity or alkalinity of a fluid.
    CDISC Terminology
    Clinical Data Interchange Standards Consortium (CDISC), 2021
  • The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
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