let's see. vacuum is an absence of atmosphere, or a presence of nothing but
room for there to be something. the earth's atmosphere applies a pressure
of approx 14.5 psi at sea level, with the pressure varying a little
depending on the weather. thus, an absolute vacuum has approx 14.5psi less
pressure than one feels at the surface of the earth. a vacuum bag with zero
pressure inside is 14.5psi lower than outside. thus it is impossible - in
earth terms at least - to talk of 25psi of vacuum. if one lived on jupiter,
one could talk about 25psi of vacuum and if the guy with the claim lives on
jupiter and is making composites there then i'll stop laughing and be
amazed.

as for laughing, the reason the engineering school profs got so upset with
this mistake is that they regarded it as something fundamental that should
have been learned at high school. so do i. it's kinda like wandering
around the world without knowing that light travels faster than sound or
that shakespeare was english. you know - basic stuff.

hugh

p.s. and i wasn't rude. i was laughing.



"Ron Thornton" wrote in message
...
Hugh,

How about laughing to yourself next time and explain to the guys that
didn't go to engineering school why it's wrong. No need to be rude.

Regards, Ron