A latex glove, dry fillers and reduced air pressure deliver this amazing and thought-provoking demonstration. Insert the vacuum valve in the glove, fill with one cup of sand or seeds, tie it up and suck air from it with the pump. Now pull and stretch the fingers and amazingly they get locked into position . . . Re-do it with coarser fillers such as lentils, mustard seeds, sesame seeds, coarse polenta, etc. to see grizzly, textured skin effects on the glove. Be warned! As the air seeps back, the hand generates peculiar, life-like sounds and movements.
Why does this happen? What does it teach about atmospheric pressure?
This kit is a great teaching aid as well as a great conversation starter about our atmosphere and its invisible fast-moving gas particles.
WHAT IS IN THE KIT?
Supplies so you can prepare 10 hands, 2 at a time
2 Vacuum valves
1 Vacuum pump
10 Strong latex gloves
1 Instruction sheet
1 cup of polenta, raw sugar or sand per hand
Vinyl or nitrile gloves cannot be used as they do not contract well. Make sure anyone using the kit is not latex intolerant.