How Many? A Dictionary of Units of Measurement
http://www.unc.edu/~rowlett/units/
From the Center for Mathematics and Science Education at the University of North Carolina at Chapel Hill comes this ever growing online dictionary of measurement. With entries on current and historical units and measurement and information on the evolution of measurement units, you will find everything from hat sizes to a “pat” of butter, from plethrons and darwins to carbs and shipping tons.This site includes several charts and scales that depict such information as apgar scoring, Beaufort scales, Mercalli scales, and a wire gauge table. Also find articles about the International System, English customary systems, the metric system, and ISO and IOC country codes.



