Timeline for In a vacuum can a cooler body radiate Infrared radiation to a warmer body?
Current License: CC BY-SA 4.0
9 events
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| Aug 19, 2018 at 19:23 | comment | added | DonQuiKong | @EricDuminil ah, yes, conduction, you're right, sorry. Radiation depends on those indirectly. One body radiates whether the other one exists or not. Conduction ... well, does a slower moving particle “let energy flow“ to a faster particle? If yes, it's independent, if no, it depends on how many particles of a are faster than some of b. It's a question of definition I guess. Mathematically you can just calculate it independently, physically ... | |
| Aug 19, 2018 at 19:09 | comment | added | Eric Duminil | @DonQuiKong as for radiation exchange, it will depend on the spectrum, emissivity, reflectance and absorption of both bodies. | |
| Aug 19, 2018 at 19:06 | comment | added | Eric Duminil | @DonQuiKong that's why I only mentioned conduction and not convection. I'm not completely sure wither. It might be a interesting question if it doesn't already exist on this site. | |
| Aug 19, 2018 at 19:00 | comment | added | DonQuiKong | @EricDuminil oh you mean when they have direct contact and not air as an infinitely great lowpass filter. Well then you might be right. Kinda. But it's not “the same process“ because the flow back depends on the overlap of the distributions while in radiation it's independent. | |
| Aug 19, 2018 at 18:49 | comment | added | Eric Duminil | @DonQuiKong Temperature describes a velocity distribution. Some particles from the cooler body will be faster than the particles from the hotter body they are in contact with. Still, at a macroscopic scale, heat will clearly flow in one direction. Hope it makes sense. | |
| Aug 19, 2018 at 14:39 | comment | added | DonQuiKong | @EricDuminil mathematically. But physically? How would that look? A heat difference is a gradient of energy, how would a flow look? | |
| Aug 19, 2018 at 13:10 | comment | added | Eric Duminil | It's also the same process for heat conduction. Heat flows in both direction but more in one direction than the other. | |
| Aug 19, 2018 at 12:37 | comment | added | Eric Duminil | Also : they will radiate a different spectrum. | |
| Aug 19, 2018 at 5:39 | history | answered | pb1729 | CC BY-SA 4.0 |