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A common demo. is two large concave mirrors with a small heater atreplacing
the focus of one. A hand placed at the focus of the other, tho > ten
yards away is noticeably warmed. "My" demo. manager suggested
the heater with a container of lN2. Again noticeable and a teaching
moment.
I am preparing a long rebut. to JD's objections to Levi, et cet.
However, since here on the west coast it's midnite, late.
bc
John Denker wrote:
Quoting John Mallinckrodt <ajm@CSUPOMONA.EDU>:
I DID say 2 pi, not 4 pi.
OTOH using mirrors and such you can significantly exceed 2 pi.
=================
It might make an interesting science-fair project to see just
how cold you can make something by radiative cooling.
Impressively cold, I'll bet.