January 7, 200422 yr what 'in Hg' does it open up at? anybody know? 5.5Hg? 6.5Hg? thanks for anybody who knows (doubtfully, not very many)
February 26, 200422 yr This is an old post, but if you have not found the answer yet, it means inches (column) of mercury. It is a pressure measurement, in the same units that a barometer uses. (5 in Hg is approximately 2.5 psi).
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