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Well said, but a higher vacuum can be pulled when
below sea level and it will read lower when above sea level. So it would be best
to know your baramic pressure before determining what your vacuum needs to be.
For people above sea level they don't have to get as high of a
vacuume because they are already at a lower pressure. If you're up on a
mountain it will be even easier.
Logan Vilas
----- Original Message -----
Sent: Wednesday, January 18, 2006 7:08
AM
Subject: Re: [Biofuel] Dewatering with
vacuum.
You're talking about 2 different things.
Talking about
so-and-so-much vacuum is sort of misleading. Your 30"Hg of vacuum means
0"Hg (0 mmHg, 0 mbar, 0 psi) absolute pressure; the vapor pressure points were
absolute pressure. Absolute pressure is measured according to how high
of a column of mercury it can push upwards with a complete vacuum at the top,
gauged pressure with atmospheric at the top. 29.92"Hg (760 mmHg, 1013.25
mbar, 14.7 psi) is standard atmospheric pressure at sea level, so that's the
maximum height you can pull up mercury with a vacuum if the other end is
exposed to air pressure at standard conditions, which means the vacuum reading
will vary slightly according to the weather, even if the actual measured
pressure stays constant.
Absolute pressure is atmospheric pressure
minus vacuum.
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