How did the Avogadro number happen? How did he know about molecules before they were even discovered? What is the Avogadro constant? All these questions will be answered in this complete history the Avogadro number, going all the way back to 400 BCE. Or just skip straight to the summary at 32:06.

I had a hard time making this video. See what went wrong here:    • Avogadro Number outtakes  

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Thanks to Dave Borgeson for the music: Enchanted, ©Dave Borgeson

Brownian motion simulator from https://tinyurl.com/mrh7eszs (Andrew Duffy)

Excerpt from BROWNIAN MOVEMENT AND MOLECULAR REALITY. By M. JEAN PERRIN via https://tinyurl.com/52m4cxfd

Excerpt from Electricity and Matter by J.J. Thomson via https://tinyurl.com/bddbdz2w

Silicon sphere photograph via National Institute of Standards and Technology

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Free resources used in this video:
Video: Da Vinci Resolve — https://www.blackmagicdesign.com/prod...
Illustrations: Inkscape: https://inkscape.org/
Animation: Wick Editor: https://www.wickeditor.com
Image editing: https://www.photopea.com/

This video was produced at Kyushu University and supported by JSPS KAKENHI Grant Number JP21K02904. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of Kyushu University, JSPS or MEXT.