With the help of a balloon and some liquid nitrogen, we can easily explain the concept of expanding gasses while they evaporate.

First we fix an Y-tube, a glass as big as a shotglass with two exits, onto a standard. We attach the balloon to one of the exits, and then we pour some liquid nitrogen into the Y-tube. The other exits is closed with a cork, so the gasseous nitrogen can only escape into the balloon, so the balloon grows.

* Standard LN2 safety issues * Y-tube can fall and break on the ground, spilling liquid nitrogen * Standard low temperature safety

- Y-tube - Balloon - Liquid Nitrogen - Standard - Cork

Image:

http://www.stichtingrino.nl/wordpress-www/wp-content/uploads/ballon.jpg

See also: "Drinking liquid nitrogen"

• Stichting Rino