Steven Shelikoff wrote:
It would probably be better for you to define an absolute vacuum as 0
psi instead of -14.7 psig.

For extremely low pressures there is a measurement called a Torr. Much more
useful and it also shows (as with all properly used technical jargon) that
you know what you're talking about.



Rick wrote:
It is far better to describe it as it really is. An absolute vacuum (or
as close as we can get to one) is about .0049 psi.

Huh? 1 Pascal is .000145psi. There is off-the-shelf industrial equipment
that goes this low.

http://www.npl.co.uk/pressure/vacuum.html

By my figures, the evacuation pressure they are talking about here is
approximately
0.000000000725psi which is a LOT lower. You could probably could the air
molecules floating by....




There is no such thing as -X.X pounds per square inch.

Great. Next you'll be telling us that vacuum don't suck.

Regards
Doug Kng