Thurs-Demo: The one that runs on batteries

Today's demo is pretty short and sweet:

The Surface Charge of Colloidal Soil Particles from Matt Kuchta on Vimeo.

The idea was modified from Ray Weil's textbook, Laboratory Manual for Introductory Soils (2009). I thought it was a great way to show off the net surface charge of soil particles - I just adjusted the demos optics in terms of wire and battery hookup.

If you think about it, there are lots of other fun things you can do with a 9V battery and an organic suspension...