Just to share my feeling of being outdated:
A couple of years ago I had a chance to ask an expert why the new composites were so much lighter and stronger than what was being produced in the past. She said "in the old days they talked about vacuum in terms of in of Hg". She said a lot of other things but I lost a lot of interest after the in of Hg comment.
Well, yeah...the in of Hg now is just what you put on the laminate before it goes into the heated and pressurized autoclave where those inches of Hg multiply significantly....but...I'm probably not investing in an autoclave anytime soon.
