Skip to main content

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

38,061,565 Views

4,444 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. 

If the Avogadro Project's silicon sphere were the earth, how far apart would the highest mountain be from the lowest valley? 

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 Exploring Theories