[time-nuts] Thunderbolt stability and ambient temperature
steveheidmann at yahoo.com
Fri Jun 12 01:07:30 UTC 2009
How about magnetic effects such as those seen with Galfenol etc. ?
--- On Thu, 6/11/09, Tom Van Baak <tvb at LeapSecond.com> wrote:
From: Tom Van Baak <tvb at LeapSecond.com>
Subject: Re: [time-nuts] Thunderbolt stability and ambient temperature
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Thursday, June 11, 2009, 5:54 PM
> The thermal conductivity isnt constant with temperature.
> It also varies between different crystalline forms of the same material.
> This can be seen in more comprehensive tables of thermal conductivity.
> In particular at cryogenic temperatures the thermal conductivity can
> change dramatically (eg in superconductors)
Excellent. Not constant; and perhaps not even linear?
If you run across a thermal conductivity table for steel
from say 0 to 1000 C let us know. From that graph we
should be able to calculate what Rex felt when he put the
red hot (1500 F?) end of the 1 inch bar into cold water.
Better yet, if some metal or material has an even more
pronounced thermal conductivity function it would make
a great party trick.
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