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Re: Heating tape





Herbert H Gottlieb wrote:


... However it seems to demonstrate that an aluminum rod will
lengthen as it is heated. As you say...it is not easy to use this
apparatus for determining the coefficient of linear expansion.

Why not use a hollow tube and run water through it? You get a uniform
temperature along the entire length of the rod, which can be easily measured
with any thermometer as the water comes out the far end. The temperature
can be changed within seconds by turning on the other tap! If my rough
estimates are right, even with tap water at 140F = 60C and and 68F=20C, a
one meter tube would expand about (1 m)(0.000025/C)(40 C) = 1 mm, which you
can easily measure with your favorite technique.


Tim Folkerts
Fort Hays State University
Hays, KS