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ESA Data Ontology

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... > Science Keywords > EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER CHARACTERISTICS > pH

Preferred term

pH  

Definition

  • A measure of the alkaline or acid strength of a substance. pH is defined as the logarithm of the reciprocal of the hydrogen ion concentration of a solution. (en)

Broader concept

Change note

  • 2018-03-07 08:26:38.0 [tstevens] Move Concepts delete broader relation (null); add broader relation (PH [14625f2a-4186-4377-a0d9-88998bb6b775,85923] - WATER CHARACTERISTICS [f7e97dc3-1181-41b5-8b90-946eb2504110,310633]);
  • 2018-03-07 12:29:01.0 [tstevens] update Definition (A measure of the alkaline or acid strength of a substance. pH is defined as the logarithm of the reciprocal of the hydrogen ion concentration of a solution.); update Definition (Adapted from: Porteous, A. 1996. Dictionary of Environmental Science and Technology, Second Edition. John Wiley and Sons. p. 413. );
  • 2018-03-07 13:20:03.0 [tstevens] update PrefLabel (pH);
  • 2018-03-12 10:23:34.0 [tstevens] update Definition (A measure of the alkaline or acid strength of a substance. pH is defined as the logarithm of the reciprocal of the hydrogen ion concentration of a solution.);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/14625f2a-4186-4377-a0d9-88998bb6b775

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