Re: RE: Re: Vacuum 101

From: Steve Preston (steveophonic@yahoo.com)
Date: Sun Sep 23 2007 - 18:38:06 EDT


This is like putting meter leads across a -20 volt
terminal and a +30 volt terminal,and thinking you have
a fifty volt power supply,because you aren't aware of
the reference point (ground).

Steve P.

--- Eric Hufstedler <huffy340@gmail.com> wrote:

>
> > The scanner said 10 in HG,and my gauge said about
> 19.
>
> If the two reading were taken at the same time, then
> one is
> pressure, the other is vacuum. Pressure + vacuum =
> ~29".
>
> The vacuum gauge really just reports atmospheric
> pressure minus
> measure pressure, which is why vac gauges usually
> only go up to
> about 30".
>
>

       
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