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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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 Thermal Properties Of Matter
 Heat And The First Law
 Change Of State
 Kinetic Theory
  video  - Brownian Motion
 Crookes Radiometer (Light Mill)
  video  - Kinetic Theory
 Gas Law
 Entropy And The Second Law

 video  - Brownian Motion


View Brownian motion of smoke particles under a microscope.


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  DEMO VIDEO DOWNLOAD / no audio / 1920x1080 / 24.19Mb/s / 399MB size  

  DEMO VIDEO DOWNLOAD / no audio / 854x480 / 5.69Mb/s / 96MB size  

Attach AmScope HD Digital camera to top of microscope and place Brownian motion cell on observation plate with side observation window facing you. Place light source as close as possible to cell's window. Light a match and let it burn for a couple of seconds. Squeeze red rubber bulb on cell, blow out match and place next to opening on cell and release bulb. If enough smoke has been sucked into the cell, smoke particles should begin to appear on the screen. Adjustments may have to be made as far as focus and cell placement.


  • Use short magnifier (with red lettering, PC4/0.1 160/0.17, see photo).
  • Observation plate location is adjustable by using microscope adjustment knobs.
  • View to eyepiece or camera is toggled using lever to the left of eyepiece.


  • Lamp
  • Microscope
  • Brownian Motion Cell
  • CCD Camera