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Vacuum Measurement

PostPosted: Thu Dec 09, 2004 2:42 am
by thatismytruck
I just found a reference to a vacuum measurement as "5 Microns" Can this be right? if so, how many inches of Mercury is that?
Thank you.

Re: Vacuum Measurement

PostPosted: Fri Dec 10, 2004 10:31 pm
by Knight
thatismytruck wrote:I just found a reference to a vacuum measurement as "5 Microns" Can this be right? if so, how many inches of Mercury is that?
Thank you.

When referring to microns as a unit of measurement for vacuum, the reference is to microns of mercury in the same way as you would refer to atmospheric pressure in inches of mercury on a barometer. One inch Hg is about 25,000 microns.

5 microns would be 5/25000ths, or 1/5000th of an inch of Mercury.

To help clarify the terminology, remember that the deeper the vacuum, the more complete the vacuum; and the more complete the vacuum, the lower the number of microns.

VACUUM - MICRONS

PostPosted: Mon Aug 29, 2005 1:04 am
by KEN KLOTZ
I see when an a/c vacuum pump is rated in microns, and I need a pump to lower the vacuum to 29 inches to pop air bubbles, will a 40 micron pump do the trick.
Thanks
Ken