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Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography


Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

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 Surface Tension
 Surface Tension
 Surface Tension with Electric Field
 Soap Films
 Capillary Tubes
 Fluid Statics
 Fluid Dynamics

Soap Films


To demonstrate the tendency of soap films to reach a 'minimal surface' for the contour presented by the frame, i.e., the surface of the soap film tends toward a state of minimum potential energy.


these demonstrations are difficult for an entire class to see, and hence are better suited for after class viewing. The cube frame gives some very interesting and beautiful surfaces. After it has been dipped, different surfaces can be generated by breaking different portions of the surface. Very large bubbles may be blown with the large coat hanger loop.


  • Bubble blowers
  • Soap Film Mix
  • Soap Frames