[TheForge] converting inches of mercury to torr?

Tue Feb 17 11:48:15 2004

Thanks Dave, I was looking at a used vacuum pump Welch #8890A on e-bay and
the description said it was rated at 0.1 torr. Apparently that must be an
error.  I can see how someone would make and error though. All of these
different pressure units and ratings for pumps seem overly complicated to
me, I can't see why they don't just rate everything by the torr. And why is
it if atmospheric pressure is 29.92  inches for instance, it would seem to
me that a vacuum pump would be trying to reach 0 inches Hg, yet some pump
manufacturers invert the scale and describe there products as being able to
reach 29.92 inches of mercury as if atmospheric pressure were 0 inches Hg.
All pretty confusing if you ask me.
T. Clark

----- Original Message -----
From: "Dave Brown" <[email protected]>
To: <[email protected]>
Sent: February 17, 2004 8:37 AM
Subject: Re: [TheForge] converting inches of mercury to torr?

> At 08:20 02/17/04, you wrote:
> >Can someone tell me how to go about converting a torr unit of measurement
to
> >inches of HG?  Specifically, I would like to know how many inches of
mercury
> >will a pump rated at 0.1 torr pull?
> >Thanks,
> >T. Clark
>
> One torr = 1 mm Hg
> 760 torr = 1 atmosphere
>
>
>
> Dave Brown
> Heritage Smithing
> Green Bay, WI
>
>
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