What does a fan do in a vacuum chamber?
by Mark Frauenfelder from on (#535WJ)
In this video of The Action Lab, the Action Man puts a small fan into a vacuum chamber and pours a bunch of little styrofoam beads in it. At atmospheric pressure the beads fly all over the place. As he reduces the pressure inside a vacuum chamber, the beads slow down and eventually stop moving. Pretty obvious, but still fun to watch.
Image: YouTube