http://www.bigbvacuumcleaners.com/what-is-total-vacuum-measured-in-inches-of-mercury/ Information on vacuum cleaners and more Tue, 10 Aug 2010 14:26:43 +0000 http://wordpress.org/?v=2.9.2 hourly 1 http://www.bigbvacuumcleaners.com/what-is-total-vacuum-measured-in-inches-of-mercury/comment-page-1/#comment-770 goober Mon, 01 Feb 2010 22:29:13 +0000 http://www.bigbvacuumcleaners.com/what-is-total-vacuum-measured-in-inches-of-mercury/#comment-770 It is the absolute pressure. One inch of mercury = 0.491161 psi It is negative psi if you are thinking of gauge pressure which is zero at normal atmospheric conditions. The absolute pressure at normal atmospheric conditions is about 14.7 psi. It is the absolute pressure. One inch of mercury = 0.491161 psi
It is negative psi if you are thinking of gauge pressure which is zero at normal atmospheric conditions.
The absolute pressure at normal atmospheric conditions is about 14.7 psi.

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