Re: Light Mill?

[William Beaty <billb@ESKIMO.COM>]

On Mon, 13 Sep 1999, Mojca Cepic wrote:

> Anyway...
> The real reason for rotation is, that the black part of the blade absorb
> more energy, its temperature is higher than the other mirror one. The
> molecules from the not complete vacuum in the bulb acommodate  on both sides
> of the blade but they left black side with higher average velocity and
> higher momentum than the mirror side. The light-mill is therefore a typical
> heat engine, which uses temperature difference to produce work.

Another experiment is to pump down the enclosure while running the light
mill.  At high pressure, nothing occurs.  As "soft vacuum" is achieved,
the light-mill begins spinning.  As the pressure drops into the "hard
vacuum"  region, the light-mill stops again.

The light-mill does not rotate if no gas molecules are present.

The light-mill does not rotate if gas density is high, and so
gas-molecules are immediately reflected from the surrounding air and back
to the surface of the blade (they cannot fly away from the surface, and so
they cannot create an action/reaction driving force.)

If a drifting gas molecule bumps into the dark surface, bonds momentarily
with an atomic oscillator, and is violently flung away as a result,
doesn't this explain everything?  The same thing occurs at the silver
surface, but the "violence" is much less.



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