Thread: Cold Radiation
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Old August 6th 15, 07:50 PM posted to uk.sci.weather
Stephen Davenport Stephen Davenport is offline
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Default Cold Radiation

On Thursday, August 6, 2015 at 2:14:51 PM UTC-4, Alastair wrote:

All solid objects emit radiation based on their temperature. An ideal object which emits a Planckian spectrum is called a black body, but the radiation emitted by non-ideal bodies is often called blackbody radiation too. The term cavity radiation is also used since, a cavity produces the thermodynamic equilibrium which is required for true black-body radiation.

If you place two object at different temperatures side by side with a gap between them, then the hotter object (with a higher temperature) will radiate with a greater intensity than the cooler object (with a lower temperature, since the power they emit is determined by the Stefan-Boltzmann Law J = sT^4, where s is the Stefan Boltzmann constant 5.67 E-8 W / sq m K^4. The cooler object will warm (i.e. its temperature will rise) because it is gaining more radiation than it is losing, and the warmer object will cool because it is emitting more radiation than it is absorbing. This is an example of the First Law of Thermodynamics. Eventually both objects will acquire the temperature of their surroundings, since each of their other five faces will be exchanging heat with that.

Now are you convinced? No, I didn't expect you would be.


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I'm certainly not. This describes thermal equilibrium and does not even come CLOSE to supporting your hypothesis. In fact, it seems to me to do the opposite.

Stephen.