An isopleth is a line on a map that connects the same amount of ratio of some type of phenomena. The above isopleth shows the hydrogen ion concentration throughout the U.S.. They measure the pH level of any given amount of surface area.
http://dwb4.unl.edu/Chem/CHEM869V/CHEM869VLinks/weather.about.com/newsissues/weather/library/weekly/aa071600a.htm
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