Posted by teacher on September 15, 1998 at 15:21:40:
In Reply to: Re: reaced the dreaded 10 in HG vacuum posted by Explain Please on September 15, 1998 at 12:32:14:
vacuum is measured in inches of mercury gage
vacuum on a 0 to 30 scale and is abreviated "in HG"
psig............in HG
0................0.........no vacuum
-2.45.............5.........some vacuum
-4.9.............10.........starting to pull
-7.5.............15.........half way to perfect vcuum
-14.7 30 pervect vacuum