posted on Mar, 13 2009 @ 01:05 PM
Firstly here’s why you “should”: Any object above absolute zero is constantly emitting infrared light and receiving it back from it's
surroundings. Because at 26C the real temperature of a body is actually 300K (given absolute zero) this infrared exchange is quite substantial.
Common sense dictates that providing two bodies are at the same temperature an infrared equilibrium should be reached.
However a dark cave is generally round, so no matter if you imagine the infrared been given of from the walls at random angles (or even perfectly
straight ones) you would have thought the centre of a cave would (on average in time) always receive more infrared than any other area.
Therefore if you place a “black object” at the centre, (even if it’s just another piece of broken cave wall) you would have thought that this
object would become substantially hotter than the outer cave walls. In fact the more cave wall area you have the hotter the object should be.
Furthermore oxygen and nitrogen are 100% transparent to infrared (hence why TV remotes work, and part of the reason why mountains are warmer at the
bottom than top. They are also bad for conducting heat. Therefore they should be nearly as good as a vacuum.
But given that there are many substantial caves in nature this would mean that there should also be lots of very burnt-unlucky bats-insects deposited
at the centre of these caves. As far as I know this is not the case, so what’s going on?
A further consideration:
The Second Law of Thermal Dynamics states “energy always flows from a high concentration to a low one”.
However one look at a Parabolic Trough en.wikipedia.org...
or even a magnifying glass starting a fire, might convince you
this isn’t always the case as infrared-light is in fact moving from a low concentration into a very high one.
But if The Second Law hasn’t stopped magnifying glasses or Parabolic Troughs working; why does it (at least appear) to stop cave bats and insects
burning to death?
I am asking this question because if the only reason why bats don’t get burnt is one like “they stay away, or move too quickly” then there is
huge free energy to be had, as using e.g. water pipes to collect this heat we could e.g.
boil water to make electricity.
Which would blatantly be just far too good to be true!!!!