[time-nuts] Double ovened 10811-60158 on ebay

[Bruce Griffiths]

Mark Sims wrote:
> Remember that heat flow is proportional to the FOURTH power of the temperature difference.  Insulation is generally a linear function.  The combination makes thermal stabilization over even small ambient temperature ranges rather problematic.
>
>
>   

Nonsense.
The radiative transfer between 2 bodies at different temperatures is 
proportional to the difference between the 4th powers of their absolute 
temperatures.
However this requires a medium between the 2 bodies that is transparent 
to the wavelenghts of interest and emissivity that is constant with 
wavelength.

In a practical situation convection and conduction are also significant.
Conductive heat flow is proportional to the temperature difference 
between the 2 bodies.

Bruce