🚀 go-pugleaf

I am no expert, but I noticed that the some of the iron pipes under my lab
tables (gas lines) are magnetic. The students have problems with some
magnetic field labs bacause of it. At first I thought that it was because
someone in the past held my very strong magnet up to them. They the
janitor talked about electric arc welding of the pipes. I suspect this
may run current through the pipes and permanently aligh the domains.

This is just my theory. Did you get any other responses? I am curious
about this also.
Laura
| Laura Sloma - lsloma@bgnet.bgsu.edu  "Never attribute to malice what can
| Physics and Chemistry Teacher         be explained by incompetence."
| Bowling Green High School
| 530 W. Poe Road
| Bowling Green, Ohio 43402   Fax: 419-354-6726

On Wed, 26 Apr 1995, Susan Wilson/Branson School wrote:

>         As the only science teacher in a small rural community, I am
> often asked science questions by the local residents.  Recently, a
> rancher was building some new pipe corrals.  He was surprised to find
> that the pipe seemed to be magnetized.  He also found that when welding
> the pipe, the metal would splatter.  He asked me for an explanation to
> this.  I remember a discussion on this listserv earlier about the
> magnetic properties of metal coat hangers.  Is this related?  Does it
> make any difference that this pipe was used in an oil filed previously?
> Could the pipe be de-magnetized by hitting with a hammer?  Why does the
> metal splatter when heated to high temperatures?
>         I am a little embarrassed to not have the answer to these
> relatively simple questions, but if any of you have the time to respond,
> please let me know.
>
>                                         Thanks,
>                                         Susan
>
>
> --
> ***************************
> Susan Wilson
> Branson School
> Box 128
> Branson, Colorado   81027
>
> suwilson@usa.net
>