Ed Dancing raisins activities. Lots of fun experiments. I have done this experiment, and seen the entire class become silent out of curiosity. It is a great engagement piece for a lesson, and it can be hands on if you ask for volunteers!
Clouds in Jar- preschool. water with shaving cream on top (clouds) then pour colored water in a droper on top the clouds and watch as it goes thru the cloud and into the water.Good site on preschool stuff