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 The United States and the Metric System A capsule history, with questions and answers, a metric chocolate chip cookie recipe, and some sample size relations (kilogram of butter to pound, etc.). http://www.nist.gov/pml/wmd/metric/index.cfm
 A Dictionary of Units of Measurement This website is great for unit conversions. Americans probably use a greater variety of units of measurement than anyone else in the world. Caught in a slow-moving transition from customary to metric units, we employ a fascinating and sometimes frustrating mixture of units in talking about the same things. This site is a one-stop shop in terms of unit conversion and equivalences. Hosted by the... http://www.unc.edu/~rowlett/units/index.html
 How Big is a Nanometer? This lab, presented by the National Nanotechnology Infrastructure Network, covers the concept of measurement on the nanoscale. Through this exercise, students will learn about "state the size of a nanometer, convert between nanometers and other metric units of length, and give concrete examples of nanotechnology use in everyday life." "How Big is a Nano", a two-part Student Guide, "Scale of... http://www.nnin.org/education-training/k-12-teachers/nanotec...
 NIST Reference on Constants, Units, and Uncertainty Created by the National Institute of Standards and Technology, this comprehensive units and measurement website contains fundamental physical constants, the International System of Units (SI), or metric system, and information on uncertainty of measurements, as well as a searchable bibliography of related papers. It provides an online conversion utility for converting between energy units and... http://physics.nist.gov/cuu/index.html
 Measurement Converter Many online calculators require a Java-capable browser. Here's one that doesn't, and will perform over 500 different unit conversions for distance, area, volume, mass, speed, temperature, pressure, energy, power, force, etc. And when you convert, say, 5 kilometers to miles, you not only get the conversion result, but a wealth of related measurements and sample conversions. http://www.convertit.com/Go/ConvertIt/
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