What is a manometer?

What's a manometer? Some kind of device to measure tyre pressure?

http://www.bike-components.de/catalo...11&language=en

--
Risto Varanka | http://www.helsinki.fi/~rvaranka/ varis at no spam please iki fi

On Wed, 16 Apr 2003 21:49:36 +0000, risto.varank did issue forth:

> What's a manometer? Some kind of device to measure tyre pressure?
>
> http://www.bike-components.de/catalo...11&language=en

A manometer is a pressure gauge, but that photo looks like a pump (with a pressure gauge) to me.

--
Huw Pritchard Replace bounce with huw to reply by mail

In article <b7kj5g$fpa$2@oravannahka.helsinki.fi>,
risto.varanka@secure.from.spam.helsinki.fi wrote:

> What's a manometer? Some kind of device to measure tyre pressure?

Penis length and rigidity.

It is indeed a pressure measuring device. It does so by lifting a liquid column, frequently water,
and so indicates directly in units of length of fluid lifted (mm_H2O, in_Hg et cetera).

It would not be convenient to use a manometer to measure pressures typical of tire pressures.

<risto.varanka@secure.from.spam.helsinki.fi> wrote in message
news:b7kj5g$fpa$2@oravannahka.helsinki.fi...
> What's a manometer? Some kind of device to measure tyre pressure?
>
>
http://www.bike-components.de/catalo...44_80&products _id=2311&language=en
>
>
>
> --
> Risto Varanka | http://www.helsinki.fi/~rvaranka/ varis at no spam please iki fi

On 16 Apr 2003 21:49:36 GMT, risto.varanka@secure.from.spam.helsinki.fi wrote:

>What's a manometer?

A translation error.

>Some kind of device to measure tyre pressure?

It _compares_ two pressures, usually (a U tube manometer) by using a tall U -shaped tube filled with
a liquid. For tyre pressures, even using mercury, this thing would be the size of a house !

Risto Varanka writes:

> What's a manometer? Some kind of device to measure tyre pressure?

http://www.bike-components.de/catalo...11&language=en

A manometer measures gas pressure and in the common use, it is a fluid filled tube whose fluid rises
with increasing pressure. What the web site shows and describes is a tire pump for which they make
glowing claims that don't ring true.

Jobst Brandt jobst.brandt@stanfordalumni.org Palo Alto CA

It's a pressure measuring device -- typically, manometers function by balancing the difference in
internal and external pressures against the force required to elevate some fluid. That's the
chemistry definition -- this product just seems to be a tire pressure guage (unless my high school
German is decieving me!)

<risto.varanka@secure.from.spam.helsinki.fi> wrote in message
news:b7kj5g$fpa$2@oravannahka.helsinki.fi...
> What's a manometer? Some kind of device to measure tyre pressure?
>
>
http://www.bike-components.de/catalo...44_80&products _id=2311&language=en
>
>
>
> --
> Risto Varanka | http://www.helsinki.fi/~rvaranka/ varis at no spam please iki fi

Yes it is a pressure measuring device.

It pretty much consists of a U shaped tube, mounted aginst a marked scale,partially filled with
fluid. One end of the U tube is open to atmosphere and the other end is connected via hose to the
pressure you are trying to measure. As the pressure increases the fluid moves inside a U tube and
the amount this moves is visually measured by reading the scale the U tube is mounted on.

Hope my description is clear

peter

"Drew Steen" <asteen@email.unc.edu> wrote in message news:3e9ecc11$1_1@news.unc.edu...
> It's a pressure measuring device -- typically, manometers function by balancing the difference in
> internal and external pressures against the force required to elevate some fluid. That's the
> chemistry definition -- this product just seems to be a tire pressure guage (unless my high school
> German is decieving me!)
>
> <risto.varanka@secure.from.spam.helsinki.fi> wrote in message
> news:b7kj5g$fpa$2@oravannahka.helsinki.fi...
> > What's a manometer? Some kind of device to measure tyre pressure?
> >
> >
>
http://www.bike-components.de/catalo...44_80&products
> _id=2311&language=en
> >
> >
> >
> > --
> > Risto Varanka | http://www.helsinki.fi/~rvaranka/ varis at no spam please iki fi

jobst.brandt@stanfordalumni.org wrote:
: Risto Varanka writes:

:: http://www.bike-components.de/catalo...11&language=en

: filled tube whose fluid rises with increasing pressure. What the web site shows and describes is a
: tire pump for which they make glowing claims that don't ring true.

It has got some pretty good user reviews. What I wonder why they sell a version with gauge and
without it - thought gauge was supposed to be standard on this model (though not so accurate)? Well
maybe I should ask them... :-)

--
Risto Varanka | http://www.helsinki.fi/~rvaranka/ varis at no spam please iki fi

Andy Dingley <dingbat@codesmiths.com> wrote in message
news:<fhrr9v0m1b65v0l5cr79t38emsveaajqe3@4ax.com>...

> On 16 Apr 2003 21:49:36 GMT, risto.varanka@secure.from.spam.helsinki.fi wrote:

>> What's a manometer?

> A translation error.

>> Some kind of device to measure tyre pressure?

> It _compares_ two pressures, usually (a U tube manometer) by using a tall U -shaped tube filled
> with a liquid. For tyre pressures, even using mercury, this thing would be the size of a house !

Manometer implies a precision laboratory-grade instrument much like chronometer implies a more
percise instrument than a clock. At least in medical fields aneroid manometers are more common
than mercury ones though mercury spygmomanometers have the advantage that they are accurate and
don't wear out.

1 mmHg or torr is 0.019PSI so a 120PSI would be 6316 mmHg. To measure this with a mercury
manometer would require a tall one but it would not have to be large. A few years ago I gave away
a bottle of mercury. If I still had it I might attempt to make such a device. I don't think it
would be practical for daily tire checking though it might be nice to check the accuracy of my
tire pressure gauges.

best, Bruce
--
Bruce Jackson - Sr. Systems Progrrammer - DMSP, a M/A/R/C Group company