Wuwei said:
The expression of SB's law as a subtraction is just a computational convenience when the object temperature and background temperature are known. It means nothing else.
Right....do you have any idea how stupid you sound...computational convenience....we are talking about a physical law here....no two way energy transfer has ever b been observed
I gave you quotes from Plank and you are saying he sounds stupid. You are saying all physicists for the last 150 years sound stupid. That is not a very convincing argument.
Set T1 and T2 to the same number...what does that make P in an equation describing a one way energy flow? I am sure that SB were bright enough to have formulated an equation describing a two way net energy flow had that been what they intended...alas, that isn't what they left us. The SB law isn't about net energy exchanges...it is a fabrication by those who need magical two way energy flow to support their magical greenhouse hypothesis.
So you think all physicists for the past 150 years have fabricated radiation exchange. You are essentially saying that two objects at the same temperature do not radiate at all to each other. Here are some references that totally disagree with you. This is not an argument between you and me. It is an argument between you and hundreds of thousand scientists over the last 150 years. I'm sorry, but you loose out. You can go ahead and invent your own physics, but you are left with no argument except to call them all fools.
Wilhelm Wien Nobel Prize speech.
Wilhelm Wien - Nobel Lecture: On the Laws of Thermal Radiation
"[Equilibrium state] ... taken as a whole for many atoms in the stationary state, the absorbed energy after all becomes equal to that emitted..."
Optical Design Fundamentals for Infrared Systems Max J. Riedl
“at thermal equilibrium, the power
radiated by an object must be equal to the power
absorbed.”
http://spie.org/publications/optipe...t/tt48/tt48_154_kirchhoffs_law_and_emissivityGustav Robert Kirchhoff (1824–1887) stated in 1860 that “at thermal equilibrium, the power
radiated by an object must be equal to the power
absorbed.”
https://pediaview.com/openpedia/Radiative_equilibriumIn physics, radiative equilibrium is the condition where a steady state system is in dynamic equilibrium, with equal incoming and outgoing radiative heat flux
Thermal equilibrium | Open Access articles | Open Access journals | Conference Proceedings | Editors | Authors | Reviewers | scientific events
One form of thermal equilibrium is radiative exchange equilibrium. Two bodies, each with its own uniform temperature, in solely radiative connection, will exchange thermal radiation, in net the hotter transferring energy to the cooler, and will exchange equal and opposite amounts just when they are at the same temperature.
What Causes the Greenhouse Effect? « Roy Spencer, PhDKirchhoff's law is that for an arbitrary body emitting and absorbing thermal radiation in thermodynamic equilibrium, the emissivity is equal to the absorptivity.
http://bado-shanai.net/Map of Physics/mopKirchhoffslaw.htmI
magine a large body that has a deep cavity dug into it. Imagine further that we keep that body at some absolute temperature T and that we have put a small body at a different temperature into the cavity. If the small body has the higher temperature, then it
will radiate heat faster than it absorbs heatso that there will be a net flow of heat from the hotter body to the colder body. Eventually the system will come to thermal equilibrium; that is, both bodies will have the same temperature and the small body will emit heat as fast as it absorbs heat.
Albert Einstein: "... Even in thermal equilibrium, transitions associated with the absorption and emission of photons are occurring continuously... "
This is what Max Planck said in 1914.
http://www.gutenberg.org/files/40030/40030-pdf.pdfPage 31:
The energy emitted and the energy absorbed in the state of thermodynamic equilibrium are equal, not only for the entire radiation of the whole spectrum, but also for each monochromatic radiation.
Page 50: "...it is evident that, when thermodynamic equilibrium exists, any two bodies or elements of bodies selected at random
exchange by radiation equal amounts of heat with each other..."