[time-nuts] Thunderbolt stability and ambient temperature
djl at montana.com
Thu Jun 11 21:07:49 EDT 2009
Thermal conductivity of iron is 0..161 at 18C, and .191 from 100C to 1245C
according to my Handbook (conditions are calories per second through a
plate 1 cm thick across an area of one sq. cm when the temperature
difference is one deg C). Point is, that's only 3 parts per 100, not
enough for the crude sensing system employed?
Tom Van Baak
>> 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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Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
Huson, MT, 59846
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