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Q: millitorrs and mercury ( Answered,   3 Comments )
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

Thanks for your question.

According to the conversion chart available at:

1 mm Hg   = 100 millitorr (microns) = 10- torr

In other words, 100 milliTorrs is 1 mm of mercury.

Since 1 mm is 0.039 inches:


then 1 milliTorr = 0.039 inches.

Let me know if there's anything else you need on this.


search strategy -- Google search on [ millitorr ]

Clarification of Answer by pafalafa-ga on 29 Mar 2006 05:48 PST

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:
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.

Subject: Re: millitorrs and mercury
From: kemlo-ga on 29 Mar 2006 08:46 PST
I'm still confused, i've never heard of a TORR!
Subject: Re: millitorrs and mercury
From: pafalafa-ga on 29 Mar 2006 11:43 PST
That's okay...I never heard of a KEMLO!
Subject: Re: millitorrs and mercury
From: kottekoe-ga on 29 Mar 2006 22:13 PST
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.

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