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EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > OXYGEN
Definition:
A colorless, odorless, gaseous element, constituting 21 percent of the volume
of the atmsophere, and essential for aerobic forms of life. Gaseous oxygen has
a chemical forumla of O2. Despite its abundance in air, the concentration of
oxygen in water is usually quite low, at just a few parts per million.
Nevertheless, this concentration is a good indicator of water quality. If it is
too low, many organisms, including fish, will die.
Reference:
Porteous, A. 1996. Dictionary of Environmental Science and Technology. John
Wiley and Sons. p. 392.
Websters College Dictionary. 1991. Random House.
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