Re: Heating tape

["James W. Wheeler" <jwheeler@eagle.lhup.edu>]

It might be interesting to use your favorite measuring technique, but to
use a tube or bar made out of NiChrome.  Then it could be easily and 
safely heated electrically. 

On Fri, 9 Oct 1998, Herbert H Gottlieb wrote:

> On Fri, 09 Oct 1998 11:12:16 -0500 "Tim Folkerts"
> <tfolkert@bigcat.fhsu.edu> >
> > Why not use a hollow tube and run water through it?  .  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 
> > 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.
> >
> Very good thought but-----
>
> 1) Most schools do not have running hot tap water in addition to the cold
> tap water at their lab and demo tables.
>
> 2) It is doubtful that you could measure a short distance of 1 mm with an
> error of 10% or less with your "favorite technique".  However if you have
> time to try this with your 1 meter long pipes of brass, copper, iron,
> aluminum and ??? I would be very interested in the results.
>
> This would make another good student investigation!
>
> Herb Gottlieb from New York City
> (Where we are "from Missouri" when it comes to doubting)