School science/Bell jar model lung
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< School science(Redirected from Constructing school science lab equipment/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.
[edit] 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 balloons causing them to deflate.
- This is a great project for classes studying health or for those students learning fluids in science.
