Skip to main content

The World's Roundest Object (and Why it Exists)

  • 37,543,725 Views
  • 4,427 Questions Answered
  • Best of Web

Let’s Begin…

The world's roundest object helps solve the longest running problem in measurement -- how to define the kilogram. A kilogram isn't what it used to be. Literally. The name, weight, and definition of a kilogram has been changing constantly since its invention, and the Avogadro Project looks to change that. 

Create and share a new lesson based on this one.

About TED-Ed Best of Web

TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.

Meet The Creators

Additional Resources for you to Explore

Customize this lesson

Create and share a new lesson based on this one.

About TED-Ed Best of Web

TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.

Meet The Creators

More from Awesome Nature