At 05:33 PM 1/27/2011, J. Forster wrote...
If you want the thermal mass to behave close to an isothermal body,
diffusivity is very important.
For example, a large mass of still water has high heat capacity, but
poor
diffusivity. Much of the heat capacity is useless.
If the equation given ["Thermal Diffusivity" = (Specific Heat) /
(Thermal Conductivity)] is correct, then lower conductivity is desired
for greater diffusitivity.
I'm not clear on how low conductivity helps make an isothermal mass -
intuitively, it seems the opposite is desired, so that any local
temperature variations are quickly balanced through conduction.
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