Is it possible to measure vacuum beyond 30" hg?

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Offline bucknaked

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Is it possible to measure vacuum beyond 30" hg?
« on: 15/06/2004 17:11:54 »
somebody told me it is impossible to measure vacuum up to or beyond  30" hg. Is this correct?
« Last Edit: 30/06/2004 09:39:03 by Exodus »
 

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Offline tweener

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Re: Is it possible to measure vacuum beyond 30" hg?
« Reply #1 on: 16/06/2004 03:11:26 »
If I remember correctly, about 30"hg is standard sea level pressure.  So, if you pull a vacuum of this same amount, there is nothing left!  If you were at higher elevation, you couldn't even get this much before there was nothing left to evacuate.

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John - The Eternal Pessimist.

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Offline gsmollin

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Re: Is it possible to measure vacuum beyond 30" hg?
« Reply #2 on: 16/06/2004 03:38:34 »
Are we discussing "measurement" or "production"? Of course, it is impossible to produce a vacuum of less than 0 mm Hg, absolute pressure, since there is no negative vacuum (at least in this phase of the universe, see "inflation"). Measuring high vacuums is a special science and technology, as well as producing them. I'm no expert, except to admire the equipment that produced high vacuums for spacecraft testing at LMCO.
"F = ma, E = mc^2, and you can't push a string."

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Offline qpan

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Re: Is it possible to measure vacuum beyond 30" hg?
« Reply #3 on: 16/07/2004 21:35:26 »
LMCO?

"I have great faith in fools; self-confidence my friends call it."
-Edgar Allan Poe

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Offline gsmollin

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Re: Is it possible to measure vacuum beyond 30" hg?
« Reply #4 on: 19/07/2004 23:31:47 »
Lockheed-Martin Company
"F = ma, E = mc^2, and you can't push a string."