Re: Heating tape

[herbgottlieb@juno.com (Herbert H Gottlieb)]

On Thu, 08 Oct 1998 22:55:52 -0400 Sam Sampere
<sampere@suhep.phy.syr.edu> writes:
> Why not Herb.  Can't you  build it and transform the angle change into 
> a linear displacement?? My version uses gas flames to heat a steel rod. 
The rod expands and busts an iron bar.  No measurements here, just proof
of themal expansion.  Loud and dramatic.
>
This sounds GREAT!!!
Why don't you write it up (with photos) for publication in The Physics
Teacher?
Meanwhile please let me have further details on the set up. How are the
bars anchored and clamped?

Herb Gottlieb 
herbgottlieb@ juno.com   FAX 718 224 4764




> Herbert H Gottlieb wrote:
>
> > On Thu, 08 Oct 1998 23:54:39 -0700 Ron Ebert <ebert@citrus.ucr.edu>
> > writes:
> > > We have a lecture demonstration which qualitatively demonstrates 
> the coefficient of expansion. It shouldn't be hard to adapt it as a 
> lab where the students can carry out quantitative measurements. It 
> consists of a long aluminum rod fixed at one end with a bench clamp. The
other 
> end rests on a wood block, but between the rod and the block is a needle
set
> > > perpendicular to the rod. The end of the needle extends out past 
> the edge of the table, and affixed to it is a large paper arrow. When
the aluminum 
> rod is heated with a burner, the arrow will rotate noticeably.
 Ron...
> > This sounds like an easy to prepare demo with excellent visibility 
> for large lecture halls. I'm going to show it at the next meeting of the

> New York City Physics Teachers .... and giving you full credit for the
> > suggestion.  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.
> >
> > Herb Gottlieb from New York City
> > (Where we invite you to see Ron's expansion demo at our next 
> physics teachers' meeting at New York University on Friday evening,
October 
> 23.)