Bell jar model lung - Definition and Overview

Bell jar model lung

This simple Bell jar model lung can be used to demonstrate the basic principles of breathing. The model should be assembled as in the diagram. A swimming cap makes a suitable diaphragm. The cap can be attached to the bottom of the bell jar, and the balloons can be attached to the Y shaped tube, with elastic bands or plastic coated wire.

How the Model Works

The cavity inside the bell jar is airtight.

• As the diaphragm is pulled down, the volume of the cavity increases. This causes the pressure to fall. Air rushes in to equalise the pressure causing the balloons to inflate.
• As the diaphragm is pushed up, the volume of the cavity decreases, the pressure rises, and the air rushes out of the ballons causing them to deflate.

See Also

• Constructing school science lab equipment
• Respiration
• Respiratory system
• School Biology experiments and demonstrations
• How-to