[time-nuts] Thermal time constant

Joseph M Gwinn gwinn at raytheon.com
Wed Mar 10 23:07:23 UTC 2010


A better metric may be stored heat for a dollar's worth of material. Scrap 
iron is pretty cheap.




From:
Bob Camp <lists at rtty.us>
To:
Discussion of precise time and frequency measurement <time-nuts at febo.com>
Date:
03/10/2010 06:03 PM
Subject:
Re: [time-nuts] Thermal time constant
Sent by:
time-nuts-bounces at febo.com



Hi

The gotcha is that you are interested in the amount of heat per cubic foot 
rather than the amount of heat per pound. You need to take the standard 
heat per weight numbers and convert them to heat per volume numbers. 

Of the things you can easily get, copper is good. Steel is not as good as 
copper, but better than aluminum. 

Bob


On Mar 10, 2010, at 5:52 PM, phil at pseng.org.uk wrote:

> Looking at the specific heat of metals:
> http://www.engineeringtoolbox.com/specific-heat-metals-d_152.html
> Wouldn't Beryllium be better instead of aluminium?
> I could foresee a few problems though eg machining holes at home, never 
mind where to get a block from.
> 
> Phil
> 
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