Fb-1 Force Exerted by a Soap Film
Published: Thursday 09 March 2006 - Updated: Tuesday 29 March 2011
Aim
To demonstrate that liquid surfaces are in a state of tension.
Apparatus
- Overhead projector
- Soap bubble solution
- Wire frames as shown
Diagrams
Click on pictures to enlarge.
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Soap Bubble Diagram |
Description
A soap film is formed on the rectangular wire frame and placed on the overhead projector. That the film exerts a force may be demonstrated by the fact that a force is necessary to increase its area. If desired a small weight may be added to the connecting cotton.