William Couture wrote:

> I suggest an experiment:
>    1) A piece of metal with a hole in it
>    2) A THIN-WALLED glass "jar" the exact size of the hole in the metal
>        (a light bulb will do)
>    3) Appropriate heat source.
> 
> Put glass "jar" in hole.  Apply heat.
> 
> See if "jar" breaks.   If it does, the hole has shrunk.
> 
> If it falls out, the hole has expanded.
> 
> Let me know how this turns out.

I might do that if/when I have the required equipment. OTOH, the expansion
coefficient of glass (9 ppm/K) is close to the one of iron/steel (12
ppm/K), so this is probably not the best "hole filler". Quartz (<1 ppm/K)
is probably better (but more difficult to find around the house).

Gerhard

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