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...

Outlines the history of Canada's adoption of the metric system and its success today.

This site contains an extensive list of various units of measurement known internationally and across several disciplines. Unit symbols are also included.

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.

This activity can be used to introduce the metric system to students.

Based on a Calfornia ordinance that limits the size of lawns, Habitat Network offers some alternatives for a species-rich backyard.

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.

The official rules for using the SI (metric) system in the US, based on the National Institute of Standards. Must download their handbook.

A collective which looks at mass and energy. Identify the forms of measurement and how to convert them as well as scientific notation. Practice application with homework problems.

On this interactive site students learn to use various units of mass to solve problems and put objects in order by their mass.

Play this game to learn to read the ruler.