An official website of the United States government.

The .gov means it's official.
Federal government websites always use a .gov or .mil domain. Before sharing sensitive information online, make sure you're on a .gov or .mil site by inspecting your browser's address (or "location") bar.

This site is also protected by an SSL (Secure Sockets Layer) certificate that's been signed by the U.S. government. The https:// means all transmitted data is encrypted - in other words, any information or browsing history that you provide is transmitted securely.

Thesaurus Search Results

pH
Subject Category
W Physical and Chemical Sciences
Definition
A measure of the hydrogen-ion activity in solution, expressed on a scale 0 (highly acid) to 14 (highly basic); 7.0 pH is a neutral solution, neither acid nor basic.
Definition Source
Schwarz, Charles F.; Thor, Edward C.; Elsner, Gary H. 1976. Wildland planning glossary. Gen. Tech. Rep. PSW-13. Berkeley, Calif.: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station
RDF/XML Format:
http://lod.nal.usda.gov/nalt/2772.rdf
Persistent URI:
http://lod.nal.usda.gov/nalt/2772
Used For
hydrogen ion concentration
Broader Term
physicochemical properties
Narrower Term
blood pH
pH stability
soil pH
Related Term
acidification
acidulants
alkali tolerance
buffer index
chemical bases
deacidification
phenolsulfonphthalein
Spanish
pH
Term Number
2772