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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

Marshmallow Man


To demonstrate the effect of the Atmospheric Pressure on fluffy air filled marshmallow puffs.


centered image
By Rico Shen, CC BY-SA 4.0, Link


Build a "Marshmallow Man" on a wire stick figure, place it inside the vacuum chamber and pump out the air. The Marshmallow Man will turn into a "Michelin Man" but even with the air being pumped out might begin to shrink once all the air is out of the marshmallow puffs. Let the air back in the bell jar and watch the Michelin man go limp.


Bring your own marshmallows. We do not stock them since they do not store too well.