Re: anodized aluminum for high vacuum?

Atmospheric pressure on the ground near sea level is ~760 Torr.  Pressure
decreases with altitude.  --Grant

"toadmonkey" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> 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
>
>
> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> -----==  Over 100,000 Newsgroups - 19 Different Servers! =-----