7D30.60 Diffusion Cloud Chamber

A chamber supersaturated with alcohol vapor is cooled with an alcohol/dry ice bath at the bottom. Can be viewed from the top or with a video camera and a television. Also shown is yet another apparatus that uses a Peltier module in place of the dry ice.

Illuminate with bright light through a horizontal slit about 1/8 inch
Dry Ice underneath, Alcohol inside, enough to wet the paper but little more
Wait 10 to 15 minutes for a good vapor layer to form