PHYSICS   LECTURE   DEMONSTRATIONS

Bell Jar


 UNIT: Fluids

PURPOSE: To demonstrate air pressure

EQUIPMENT:
1. Pump
2. Bell Jar
3. Marshmallow or Shaving Cream

SUGGESTIONS:
1. 

A small amount of vacuum grease should be used on the plate.
2. 

The shaving cream goes a long way, use a small amount.

DISCUSSION:
--
1.                                  2.                                     3.                                     4.     

   5.                                     6.                                        7.

1. Equipment
2. Shaving Cream
3-5 Expanding as pressure decreases
6. Maximum expansion
7.  Collapse as the vacuum is released