Northwestern Physics Demos                                 Go back to Thermodynamics 
DCS# 4D30.10NWU# H30Location:    6 D 1
title: Radiation Pressure Pinwheel
aka: Crookes Radiometer

Description:
  Place a radiometer in front of an incadescent lamp to show spinning from un-even heating of the vanes of the radiometer.

Question?
   Which way should it spin?
    What happens if an IR filter is placed between the lamp and the radiometer?
     What happens if a very cold object is brought near the radiomter?
pix of lamp and radiometer