Brownian Motion and the Whitley Bay smoke cell

 Robert Brown first noticed the weird random agitation of particles by looking at pollen in a microscope. These days we look at smoke particles injected into a pot that can be illuminated from the side. This is called a Whitley Bay smoke cell.

 Einstein explained what was going on in 1905 by saying that the big visible smoke particles were being hit by tiny invisible air atoms. I modeled this by putting a table tennis ball into my kinetic model that creates a random motion of ball bearings. The ball bearings move randomly and that makes the table tennis ball move randomly as well. Einstein's analysis finally proved the long-postulated and assumed existence of atoms.

And special thanks to Di for her perseverance in getting the cell to work for us :)