Did you see the sleight of hand?
Pekka Pirilä | November 21, 2012 at 4:25 am | The Second law was originally formulated as a postulate that was needed to explain observations. It is one basic postulate in the formal mathematical theory of Classical Thermodynamics. At that time it was not possible to explain this theory from anything more detailed or more fundamental.
The 2nd Law was brought in to ‘correct’ the 1st which doesn’t care which way anything travels as long as energy is conserved, it would be quite happy with heat flowing from colder to hotter, corrected by the observation that heat always travels from hotter to colder and never the other way around.
There is nothing more fundamental in heat transfer than the 2nd Law – that heat always flows spontaneously from hotter to colder, it’s a fact, an observable fact. It takes work to change that. Your fridge works because we know this. If it was not a fact we would end up with perpetual motion and unless you have something to prove perpetual motion is physically possible then I suggest you stick with the 2nd Law as it is writ.
During the 19th century scientists like Maxwell and Boltzmann developed a theory that goes deeper in the questions of thermodynamics. They realized that classical thermodynamics can be derived from some simple assumptions on the micro-physics and the mathematical theory of statistics. The theory of statistical thermodynamics is a more powerful theory than classical thermodynamics as the latter can be derived from the former and as statistical thermodynamics can explain additional phenomena.
Throwing “quantum” around to confuse the subject, and “statistical” is another AGWSF meme rebuttal, doesn’t mean anything unless you can prove that heat flows from colder to hotter, you will just have to grin and bear it.
You cannot pretend that this breaks down on your imagined quantum level when you can offer no proof that it doesn’t obey the 2nd Law at this level, but which level is anyway totally and utterly irrelevant to this subject, and you can pretend that “photons travel in all directions therefore ..”, or pretend that there is some magical spontaneous statistical “net” created out of “heat also flows from colder to hotter” when it breaks the 2nd Law of heat flow which requires work to be done to achieve such a thing, and when the real statistical net is still as Boltzmann’s probabilities that atoms would be travelling at certain speeds and in certain directions – you still have to show that radiant heat photons travel spontaneously from colder to hotter and all, all, empirical evidence from countless real world applications have NEVER observed this. The Real Science Discipline of Thermodynamics has studied this in depth. It understands heat and work.
The state of statistical thermodynamics was not entirely satisfactory in the 19th century as there were some serious problems in the theory. Most notably the ultraviolet catastrophe could not resolved. What was needed to make the theory consistent was Quantum Mechanics. The Quantum Statistical Thermodynamics is a theory that is free of serious internal contradictions and can be used to derive the Classical Thermodynamics wherever this is applicable.
There was no ultra-violet catastrophe, it violated conservation of energy. The catastrophe was only in the minds of some who imagined infinite runaway global ultraviolet being produced from a finite source…
..and Planck didn’t have this in mind anyway when he came up with quantum, it appears, that this “quantum” explanation has just been tagged onto the ultra-violet catastrophe as “having solved it”, when it does no such thing since it wasn’t an observable phenomenon anyway. If you say it does, then please, explain exactly how.
Hmm, find this all the time in the AGWSF world, here’s an example: http://damnedhippie.wordpress.com/2011/10/09/the-ultraviolet-catastrophe/
“If the rock follows the old laws of physics, it would radiate an infinite amount of high-energy ultraviolet radiation.”
You, generic, can claim that this imagined catastrophe comes from “the old laws of physics and only quantum saved this”, but it clearly doesn’t since it ultra-violates the “old laws of physics of conservation of energy”.
But the next bit is funny, “So, in exchange for a finite amount of electrical energy, our scientist would get an infinite amount of light energy. Set in front of it a solar-powered mechanical device that generates electricity to run the hot plate, and you have a perpetual motion machine.”
Which is exactly what your “backradiation” is when further heating the warmer surface as it radiates heat from the colder atmosphere.
What we have from AGWScienceFiction extrapolation is the ludicrous scenario I was told a while back, that a hunter could leave a chunk of raw meat in his igloo while he went out for a few hours and on his return that chunk of raw meat would be his dinner cooked by “backradiation” from the ice..
As I’ve said, AGWSF is internally incoherent and makes nonsense of the real world. None of its explanations make sense because they are not meant to, the Greenhouse Effect fisics was designed to confuse. And to that end they’ll play every trick in the book to hide that its Greenhouse Effect fisics is fake.
Presently we have some confusion and a lot of empty rhetoric that originates from the presence of two alternative ways of defining heat, the classical one, and the “modern” one. The modern approach has the advantage that it agrees better with everyday use of the word. In climate discussion we meet the controversy only when skeptics try to use the classical definition to confuse or to “prove” their false “theorems”.
There’s nothing wrong with the classical definitions of heat. The only confusion here is that you are trying to change it to mean something entirely imagined from the idiotic meme “all electromagnetic energy is the same and all creates heat” because you want to pretend that “visible light can heat matter and no longwave infrared reaches us from the Sun”. It is idiotic because it is gobbledgook, as I have explained above.
You can pretend all you like that that your “quantum” and your “statistics” give you a “modern” explanation, but since you still end up with runaway global warming from a cold atmosphere heating a hotter surface/no means of stopping heat flowing from colder to hotter, you’re clearly talking outside of the realm of our real physical reality. So your “modern heat” is as it appears here, mangling real physics and the history of it to pretend that it exists.
But back to my point, I’m not interested in “backradiation” arguments here, they’re irrelvant:
You’re the one confused by this deliberate manipulation of fake fisics. That’s why you don’t realise your claim that “the Sun gives off very little longwave infrared” doesn’t make sense.
Because you don’t understand what you’re really saying is that “the Sun gives off very little heat”.
Longwave infrared is the thermal energy in the electromagnetic spectrum, it is invisible, it is what we feel as heat because it is heat, it heats us up because it is capable of doing so, it causes our whole molecules of matter to vibrate, which is kinetic energy which is heat. It is what we feel as heat from the Sun, read the NASA quote. You claim the Sun gives off no heat!
You don’t understand what you’re saying because you have been convinced that heat is something different and convinced that visible light can heat matter so you don’t notice the real heat from the Sun is missing in your world.
I can only suggest that you take up the direct science challege I gave earlier, show that visible light from the Sun can heat the matter of land and water at the equator to the intensity this is heated in the real world which is what gives us our huge equator to poles winds and dramatic weather systems.
Or, get to grips with what I am saying here about the real missing heat from the AGWSF Greenhouse Effect energy budget..
We cannot feel shortwave from the Sun.
This is a physical fact of our reality.
The heat you feel from the Sun is THERMAL INFRARED, LONGWAVE INFRARED. As traditional physics still teaches.
Please, think about what I have just said. Traditional physics contradicts you.
You cannot make such claims against traditional physics teaching without offering some physical proof..
It’s misleading to present downhill flow of water as an analog for the flow of heat from hot to cold. It’s misleading because the flow of water is a collective flow where every molecule is forced to move with the flow. The transfer of heat by conduction or radiation is a statistical phenomenon. In conduction the micro level energy transfer goes always in both directions and the overall flow of heat is due the larger number (and average energy) of micro level movements in one direction than in the other. In this respect conduction is not any different from radiative energy transfer where the same is true. The difference between conduction and radiative energy transfer is that the distance covered by a single micro level event is extremely short in conduction while its often rather long in radiative energy transfer. For this reason it’s rather easy to intercept the radiative energy transfer and measure radiation from each direction while intercepting conduction is either impossible or much more difficult.
As heat flow from hotter to colder is forced.., by the temperature difference. That is what is meant by “spontaneous” in the 2nd Law. It takes work to change this direction.
http://www.phys.unm.edu/~gbtaylor/phys102/lectures/9_temperature.pdf
“2nd Law of Thermodynamics
● Imagine two bricks at different temperatures in
thermal contact
– If the hot brick were able to extract heat from the cold
brick, would this violate the 1st law of
thermodynamics?
● No. Not if the cold brick becomes even colder so that the
total amount of energy is conserved.
– This sort of behavior is prohibited by the 2nd law of
thermodynamics:
● Heat never spontaneously flows from a cold object to a
hotter object.
– Heat can be made to flow in the opposite direction, but only by
doing work on the system or by adding energy from another
source.”
You can pretend the 2nd Law doesn’t exist, you can pretend that it means something entirely different ‘to your modern understanding’, by inserting “net” where none is required, from taking statistics out of context, and so on, but until you can show and tell you’re just creating imaginary scenarios.
The 2nd Law limited the 1st to observation. Water always flows downhill. It takes work to change that direction, just as it takes work to change the spontaneous flow of heat from hotter to colder.
It’s time AGWSF supporters opened their eyes and looked at the real world around them..
..and felt the real world around them. The heat we feel from the Sun is longwave infrared, thermal infrared, the Sun’s thermal energy on the move to us transferred by radiation.
Your Greenhouse Effect world doesn’t have this.
And since shortwave from the Sun isn’t thermal and can’t heat matter then your world has no heat from the Sun at all.
Think about this, please.