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Simon Fraser University
Chem1 Virtual Textbook: The Measure of Matter
This site examines the specific difference between mass and weight in addition to length, temperature, and time.
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.
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.