What does PSU stand for?

MLA style: "PSU." Acronym Finder . 2012. AcronymFinder.com 11 Feb. 2012 http://www.acronymfinder.com/Practical-Salinity-Units-(PSU).html
Chicago style: Acronym Finder . S.v. "PSU." Retrieved February 11 2012 from http://www.acronymfinder.com/Practical-Salinity-Units-(PSU).html
APA style: PSU. (n.d.) Acronym Finder. (2012). Retrieved February 11 2012 from http://www.acronymfinder.com/Practical-Salinity-Units-(PSU).html

Practical Salinity Units

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

Observations are made using practical salinity units (psu), a unit of measurement that describes the concentration of dissolved salts in water, and the radiometer is capable of detecting changes as small as 0.

United Kingdom: NASA Goddard Delivers Aquarius Radiometer to JPL