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Physics
Classical Physics
Thermodynamics
Equilibrium between objects at different temperatures?
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[QUOTE="Steve4Physics, post: 6852698, member: 681522"] I’m on shaky ground but I’m sure that someone else will be able to correct (or expand upon) this if needed... I think the system you describe is infeasible because it is not possible to have an (optical) system such that “[B]all[/B] the radiation from body 1 is focused onto body 2 and vice versa”. This would violate conservation of etendue. ‘Etendue’ is a measure of how much light (or radiation in general) ‘spreads-out’. Conservation of etendue can be derived from the second law of thermodynamics. For example, it tells you that you can’t focus sunlight to such an extent that the energy-density corresponds to a temperature higher than that of the sun’s surface. Take a look at [URL]https://en.wikipedia.org/wiki/Etendue[/URL] and/or do a search. [/QUOTE]
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Physics
Classical Physics
Thermodynamics
Equilibrium between objects at different temperatures?
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