The Stefan-Boltzmann constant, symbolized by the lowercase Greek letter sigma ( ), is a physical constant involving black body radiation. A black body, also called an ideal radiator, is an object that radiates or absorbs energy with perfect efficiency at all electromagnetic wavelength s. The constant defines the power per unit area emitted by a black body as a function of its thermodynamic temperature .
You'll notice it is a function of temperature of a body and not a function of the temperature of the surroundings. Were they wrong?
[MENTION=40906]SSDD[/MENTION] Is your screen too cold? Can't see your error?
Do you need a braille screen? Translator?
You still talking? Let me know when you have an observed, measured example of energy transferring from a cold object to a warm object at ambient temperature...till then, you are doing nothing but professing your faith. Fine if you want to believe...Without some actual evidence, however, I don't.
The formula clearly says a body emits energy as a function of its thermodynamic temperature.
Can you understand what that means?
It doesn't say it emits unless something warmer is nearby.
a human, having roughly 2 square meter in surface area, and a temperature of about 307 K, continuously radiates approximately 1000 watts. However, if people are indoors, surrounded by surfaces at 296 K, they receive back about 900 watts from the wall, ceiling, and other surroundings, so the net loss is only about 100 watts.
This guy in the 1963 seems to have measured energy transferring from cold surroundings (296 K) to a warmer human (307 K). How'd he do that? It's easy, he used the Stefan-Boltzmann constant, the one that you keep ignoring.