[time-nuts] Mass vs BTU Function

J. Forster jfor at quik.com
Thu Jan 27 16:18:44 EST 2011


If you are considering conductivity for dynamic reasons, the correct
figure of merit is "Thermal Diffusivity"

= (Specific Heat) / (Thermal Conductivity)

-John

=============


> Most metals have a specific heat around .34, where water is 1.0. ( so .34
> BTU to raise a pound od aluminum by 1 deg F)
>
> The have different densities, so on a per volume basis, you want dense.
> Tungsten for instance or osmium
>
> You also need to consider conductivity though.   Gold is good
>
> On Jan 27, 2011, at 3:38 PM, Perry Sandeen <sandeenpa at yahoo.com> wrote:
>
>> List,
>>
>> Please help me with this physics question.
>>
>> If one has a given cube, say 2 x 2 x 2 inches.  And one has the choice
>> of aluminum, copper, or lead (just for an example).  Will each store or
>> hold the same amount of BTUs or does the density make a difference?
>>
>> IF the density makes a difference, can someone give me the approximate
>> difference?
>>
>> The practical end of this question is consideration of thermal mass
>> surrounding an oscillator,
>>
>> TIA
>>
>> Perrier
>>
>>
>>
>>
>>
>>
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