Re: anodized aluminum for high vacuum?

On Sat, 01 Nov 2003 04:17:10 GMT, "hanson" <[EMAIL PROTECTED]> wrote:
>Yo, Josh, old bud,
>Easy on the that "generally". I think that all non-load bearing,
>non-ablating space vehicle skins are made from Aluminum, 
>2024, 6061 or 7075, about the thickness of a beer can.
>Most of it is not even anodized, but bare, maybe CrO4/SiF6 treated.
>The pressure in space at 130 - 140 miles up is about 10e-6 torr.
>250 miles up at MIR we have a vacuum of about 10e-8 torr, and
>at the Hubble Space Telescope at about 370 miles up the pressure 
>is near 10e-9 torr. Alu appears to serve quite well.
>Have fun, Josh,
>hanson 
>
I'm confused by what you said.  What is a torr and, I assume it's a type of
pressure, how is it that the pressure changes in orbit?  I, again, have always
assumed it was absolute zero pressure in orbit.  I take it I'm wrong?

Could you help me understand this?
TM

--
Toadmonkey: "Now now. Brain popping and world crashing may be hazardous to ones 
perception of reality. 
Very dangerous business that can lead to madness or something worse for some, truth."


Remove "3+4" from addy before replying


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