Demonstrates: How air pressure, or lack thereof, can affect objects.
Description: 2 small hemispheres.
Instructions: If needed, add grease along the edges of the hemispheres. Put the hemispheres together, connect vacuum pump to the spigot on one of the hemispheres, and run the pump. After a short while, you can close the spigot, remove the vacuum tube, and show that the hemispheres will stay together.
Items Used: Magdeburg hemispheres, and vacuum pump (vacuum grease if needed on hemispheres).
