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 Subject: millitorrs and mercury Category: Science > Chemistry Asked by: fie-ga List Price: \$20.00 Posted: 29 Mar 2006 05:30 PST Expires: 28 Apr 2006 06:30 PDT Question ID: 713123
 `100 millitorrs equals how many inches of mercury?`
 Subject: Re: millitorrs and mercury Answered By: pafalafa-ga on 29 Mar 2006 05:38 PST
 ```fie-ga, Thanks for your question. According to the conversion chart available at: http://www.highvacpumps.com/engineering/formulas.html FORMULA & FACTORS 1 mm Hg = 100 millitorr (microns) = 10-¹ torr In other words, 100 milliTorrs is 1 mm of mercury. Since 1 mm is 0.039 inches: ://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2005-04,GGLD:en&q=mm+in+inches then 1 milliTorr = 0.039 inches. Let me know if there's anything else you need on this. pafalafa-ga search strategy -- Google search on [ millitorr ]``` Clarification of Answer by pafalafa-ga on 29 Mar 2006 05:48 PST ```P.S. Ooops...a bit of a mistake, I'm afraid. The answer is .0039 inches of Hg, since 100 millitorr is 0.1 mm Hg (not 1 mm, as I said originally). There's a very nice conversion tool, that you can see here: http://www.sengpielaudio.com/calculator-pressureunits.htm Conversion of pressure or stress units Find the millitorr box (about 1/3 of the way down the page) and enter a value, such as 100 millitorr. The other boxes on the page will instantly show you the conversion for this value. Sure enough, 100 millitorr = 0.0039370072 Inch of mercury (Hg) (32 °F) Cool, eh? Sorry for any confusion. paf```
 `I'm still confused, i've never heard of a TORR!`
 `That's okay...I never heard of a KEMLO!`
 ```Since Torricelli invented the barometer, it is not surprising that there is a unit of pressure named after him. One torr is equal to 1 mm of mercury, i.e. the pressure underneath a column of mercury with a height of 1 mm. Atmospheric pressure is about 760 mm, or equivalently, 760 torr.```