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Politics : The Environmentalist Thread
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To: Thomas A Watson who wrote (22391)7/20/2008 12:58:54 PM
From: maceng2  Read Replies (1) of 36917
 
Prévost theory of exchanges states that all bodies above absolute zero emit radiation energy. This would apply to all molecules in the atmosphere (for example) at -100 deg C. They would emit radiation in all directions including downwards towards the Earth too.

The second law of Thermodynamics states that the surface of the Earth at 0 deg C(for example) would radiate energy upwards in a similar way, but would radiate more energy, and in an insulated enclosed system, the air molecules at -100 deg C would heat to 0 degrees C.

So lets say you had a metallic ball placed several meters from a very hot wood fire in camping ground devoid of all greenhouses. The open ground is such that we can ignore the effects of convection and air conduction. The metallic ball would start at the temperature of the ambient air, but gradually heat from radiant energy from the fire. It will reach temperature say "X". If someone then placed an asbestos blanket around the back (dark) side of the metallic sphere and sides, the temperature would rise in temperature to (X+1) degrees maybe more in 30 minutes. The asbestos blanket (which also started at the ambient air temperature) would also heat up with the metallic ball. The temperature of the ball would continue to climb until the radiant heat loss from the metallic ball & asbestos blanket again reached an equilibrium. The important point is the ball got hotter and the 2nd law of thermodynamics was not broken.
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