Re: shock wave as pressure builds in a vacuum?

[Roger Haar <haar@PHYSICS.ARIZONA.EDU>]

Brian,
        Could you give a brief overview of the rapid
inrush of air into a vacuum that gives  the
temperature of 100K.  ( I assume this is 100
degrees kelvin rather than 100,000 degrees)  At
first thought I do not see why it would happen.

        I have broken a beryllium window on an x-ray
Si-Li detector when venting the chamber to which
it was connected.  I do not think a rise of 100K
would weaken beryllium very much.

Thanks
Roger Haar


Brian Whatcott wrote:
> At 03:52 PM 5/28/2003 -0400, Stefan Jeglinski , you wrote:
>
> Likening Stefan's situation to the classical problem of rapid inrush of
> room temperature air into an insulated vacuum bottle, where a temperature
> rise of more than 100K is expected, the thin polymer membrane will
> possibly not have been selected for strength at elevated temperature,
> and so may be weakened  to its yield point locally.    If that were the case,
> a high temperature film might suit the purpose.
> (Inveterate list members may recall that a certain UBC Emeritus posed a
> contrasting problem: if a tubeless tire leaks at some rate, what is the
>   temperature rise? In that case it was negligible)
>
> Brian Whatcott   Altus OK