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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
 Fluid Statics
 Hydrostatic Pressure dependence on depth
  video  - Pascal's Vases
 Hydraulic Press
  video  - Balloon in Vacuum
 Marshmallow Man
  video  - Crush the Soda Can
 Magdeburg Hemispheres
 Pressure Gauges
 Qualitative Pressure Gauge
  video  - Archimedes' Principle I
 Archimedes' Principle II
 Archimedes Principle III
 Cartesian Diver
 Buoyancy of Air
  video  - Weight of Air
 Fluid Dynamics

 video  - Archimedes' Principle I


To show that the buoyant force exerted on an object is equal to the weight of the displaced water (or fluid).


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  DEMO VIDEO DOWNLOAD w/ sound / 1920x1080 / 24.19Mb/s / 251MB size  

  DEMO VIDEO DOWNLOAD w/ sound / 854x480 / 5.69Mb/s / 60MB size  

Get the students to believe that the inside of the silver cylinder has the same volume as the blue cylinder (put the blue cylinder into the silver cylinder). Hang the cylinders from the scale as shown and record their weight. Lower the blue cylinder into the water and show the change in weight. With the blue cylinder still submerged, fill the silver cylinder with water. Since the silver cylinder holds water equal in volume to the blue cylinder, the reading on the scale should return to the original reading before lowering the blue cylinder into the water.


  • 4000 ml. Beaker
  • 600 ml. Beaker
  • Clamp
  • 2 Lab Jack
  • Metal Cylinder and Holding Can
  • Newton Scale
  • Stand
  • Water