Re: Dew Formation

[Bernard Cleyet <anngeorg@PACBELL.NET>]

A common demo. is two large concave mirrors with a small heater at the
focus of one.  A hand placed at the focus of the other, tho > ten yards
away is noticeably warmed.  "My" demo. manager suggested replacing 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.