World's Roundest Object!

The definition of a kilogram is debatable. An informative video (as part of a larger playlist) shares the problem with the current definition of a kilogram. It explains why the concept became a challenge to explain as well as multiple scientific endeavors to redefine the standard of measurement.

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CCSS: Adaptable
Instructional Ideas

Classroom Considerations

  • Relies on prior knowledge of Avogadro's constant

  • Connects history, math, and science
  • Includes closed captioning in 17 languages for ease of note taking
  • Introduces more than one famous scientist

  • None