Proof of the Greenhouse effect:-
Note1:- (You will need at least TWO of your sleepless nights again)
(a) Walk outside of your house in the middle of the night with no cloud cover. A clear night. Note temperature.
(b) Walk outside of your house in the middle of the night with full cloud cover. A cloudy night. Note temperature.
Note2:- for the experiment to be done without bias, approximate same time of year should be used.
I am sure most can answer this question already, and can confirm the "Greenhouse Effect".
No need for glass panes, putty, or tomatoe plants. I fully know that a greenhouse gets hotter becuse it traps the air from covecting and mixing. No need to expalin again.
QED.
Note3:- 2nd law of Thermodynamics conserved in all scenareos. No need to hide from the "physics police" while conducting above experiment.
(thank you HAWKEYE for this experiment idea)
Not convinced yet?
OK read this post here....
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atmoz.org
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Lazaron 08 Aug 2007 at 4:11 pm
-(a bit of the post missed out here... pb)-
Heat is the net transfer of energy between two macroscopic systems due to a difference in temperatures. Heat is not a substance (heat is not caloric), heat is not moved or transferred… heat is the net transfer of energy.
Serway & Beichner, “Physics for Scientists and Engineers” fifth edition: “Heat is defined as the transfer of energy across the boundary of a system due to a temperature difference between the system and its surroundings.”
The second law correctly stated wrt the transfer of heat from a colder system to a warmer one in the form of the Clausius statement: “It is impossible to construct a cyclical machine whose sole effect is the continuous transfer of energy from one object to another object at a higher temperature without the input of energy by work.”
Heat refers to the net flow of energy between two systems and the second law refers to macroscopic systems. So we are talking about the net flow of energy between macroscopic systems. Consider two molecules at different temperatures seperated by some distance. Both radiate energy. It is physically possible for a quanta of energy to be radiated from the colder molecule and absorbed by the warmer molecule, but that the reverse does not occur. Since the second law relies on the statistical properties of macroscopic systems this does not violate the second law. Consider two macroscopic systems, adjacent and at different temperatures. It is physically possible (and highly probable) that energy radiated by the colder system will be absorbed by the warmer system. But it is extremely unlikely that this energy will exceed the energy flowing in the other direction. In other words, the net energy flow will be from the warmer system to the colder one. This is what is meant by the seccond law of thermodynamics.
It is a fact that greenhouse gasses absorb IR emitted from the surface.
It is a fact that these gasses radiate energy in all directions, not caring which direction is ‘down’ or what the temperature of ‘down’ is.
It is a fact that these gasses radiate energy toward the surface.
It is a fact that some of this energy will be absorbed by the surface.
It is a fact though, that energy transferred to the atmosphere from the surface exceeds the energy transferred from the atmosphere to the surface, this is how the second law applies.
Without an atmosphere, the energy from the surface would be radiated directly to space.
That the atmosphere radiates some energy to the surface results in warming relative to the above scenario.
Do not be confused by Gerlich’s conflation of net energy flow with energy flow in one direction.
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Thank you Lazaron !. Is that your real name or is that a "handle" ? pb. |
