Re: Vacumm Pups Source

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Luc by way of Terry Fritz <twftesla-at-uswest-dot-net>" <ludev-at-videotron.ca>

Hi Jan



Tesla list wrote:
> 
> Original poster: "Jan Florian Wagner by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <jwagner-at-cc.hut.fi>
> 
> Hi,
> 
> > I've considered playing with water aspirators at times, but have always
> > figured the vapor pressure of the water in the pumping line would be
> > unacceptable for such purposes as you describe.
> 
> Just want to pop in here... with a cheap aspirator you can reach about 50
> Torr with a household water faucet, and maybe can do better with higher
> water pressure and a better constructed aspirator.

What is determine mostly how high vacuum you can reach with an
aspirator is the temperature of the water; the cooler the water
the higher the vacuum because vapor pressure of water is higher
at higher temperature.

Luc Benard

> I've successfully used
> aspirators to pump down experimental plasma globes, no probs with water
> vapour getting into the globe through the line, so there should be no
> problems using one to "low-pressurize" a home made capacitor.
> An alternative could be refrigerator pumps. They're slow (but cheap ;o)
> and I've heared you can go well below 10 Torr.
> 
> cheers,
> Jan
> 
> --
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