Each pollen grain was being unequally bombarded by the water molecules in motion. This causes the pollen grains to 'random walk' on the surface of the water.

*expected*to end on. This expected distance is computed from d = L√n where L is the average step length and n is the number of steps per walk. In this project, L = 3. The closer the circles, the closer the agreement between theory and experiment.

The
project can be viewed and downloaded by clicking on the link below the graphic.

This
project is the 2-dimensional version of my 1-dimensional project, Feynman's
Random Walk, that can be viewed at https://scratch.mit.edu/projects/11282377/.

The Scratch blog post can be seen by clicking on this link.

A free PDF document that describes Brownian Motion in more detail and explains the coding can be had by sending an email request to grandadscience@gmail.com.