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University of North Carolina
A Dictionary of Units of Measurement
This site contains an extensive list of various units of measurement known internationally and across several disciplines. Unit symbols are also included.
Texas Education Agency
Texas Gateway: 1.2 Physical Quantities and Units
By the end of this section, you will be able to do the following: Perform unit conversions in both SI and English units, Explain the most common prefixes of SI units, and be able to write them in scientific notation.
National Institute of Standards and Technology (NIST)
Nist: Rules & Style Conventions for International System of Units (Si)
The official rules for using the SI (metric) system in the US, based on the National Institute of Standards. Must download their handbook.
TED Talks
Ted: Ted Ed: Why the Metric System Matters
For the majority of recorded human history, units like the weight of a grain or the length of a hand weren't exact and varied from place to place. Now, consistent measurements are such an integral part of our daily lives that it's hard...
Colorado State University
Metric Numbers to Remember
Look to this site for many important numbers and conversion factors used between the metric system and the customary system, such as speed of light, body temperature, distance from sun to earth, plus more.
E-learning for Kids
E Learning for Kids: Math: Market Place: Mass
On this interactive site students learn to use various units of mass to solve problems and put objects in order by their mass.