PURPOSE: To demonstrate diffusion.
DESCRIPTION: Two tubes are presented, both having a small amount of iodine crystals in the end. However, one contains air at a low pressure and the other contains air at near atmospheric pressure. When the iodine is heated, the difference in diffusion rate of the iodine through the two tubes is readily apparent.
REFERENCES: (PIRA 4D50.47)
EQUIPMENT: Two iodine diffusion tubes, gas burner, and bright point source of light.
SETUP TIME: None.
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