"W. Watson" <wolf_tracks@invalid.com> wrote in message
news:t%QPh.2248$H_5.1353@newssvr23.news.prodigy.net...

How about if the bottle is filled with air or some other gas?

Androcles wrote:

"W. Watson" <wolf_tracks@invalid.com> wrote in message
news:siCPh.20196$uo3.16623@newssvr14.news.prodigy.net...

Are there any inexpensive devices that can be used to measure pressure
from inside an enclosed but transparent container like a bottle?
--
Wayne Watson (Nevada City, CA)

Web Page: <speckledwithStars.net>

Yes, and very accurately once calibrated.
The weighted air bubble does a good job.
Take a plastic straw and seal one end, then place a hole
in the side about 1/4 inch below the sealed end and
drop it in to the bottle, sealed end up. It will fill with fluid up to
the hole and leave an air bubble under the seal. Thus it will float.
Now pressurize the bottle, the air bubble will have a
lower volume and the straw will sink. Lower the pressure
again and the straw will rise. You may need to add some
blue tack to bottom of the straw to get the balance right, but it will
work. It is a simple matter to mould plastic into the shape of a diver or
an octopus or some such once you have it calibrated and then drop it into
a screw top coke bottle.

--
Wayne Watson (Nevada City, CA)

Web Page: <speckledwithStars.net>

Yes, use a differential pressure meter with one side attached to a
calibrated pressure.

Michael

You said inexpensive, I gave you inexpensive for free.
I thought you wanted a toy for a soda-pop bottle, but if you mean
business then let's talk money.

The more stringent your specification the higher the price,
but your requirements can be met.
How about £50 ($100) an hour, minimum fee 1 x 8-hour day?
Or just give me a full specification and I'll quote you a price,
in most cases there will be something commercially available
and I'll only charge you a search fee.
If not then I'll build it for you after you sign a contract, but you
are not going to get inexpensive that way. There are tight laws
governing pressure vessels in all Western countries and have been
since steam engine boilers exploded 150 years ago.
A transparent pressure vessel? That's going to be very limited,
OSHA will be all over it like drosophila melanogaster on two-day
old mashed banana.



"W. Watson" <wolf_tracks@invalid.com> wrote in message news:t%QPh.2248$H_5.1353@newssvr23.news.prodigy.net...

How about if the bottle is filled with air or some other gas?

Androcles wrote:

"W. Watson" <wolf_tracks@invalid.com> wrote in message news:siCPh.20196$uo3.16623@newssvr14.news.prodigy.net...

Are there any inexpensive devices that can be used to measure pressure from
inside an enclosed but transparent container like a bottle?
--
Wayne Watson (Nevada City, CA)

Web Page: <speckledwithStars.net>

Yes, and very accurately once calibrated.
The weighted air bubble does a good job.
Take a plastic straw and seal one end, then place a hole
in the side about 1/4 inch below the sealed end and
drop it in to the bottle, sealed end up.
It will fill with fluid up to the hole and leave an air bubble
under the seal. Thus it will float.
Now pressurize the bottle, the air bubble will have a
lower volume and the straw will sink. Lower the pressure
again and the straw will rise. You may need to add some
blue tack to bottom of the straw to get the balance right,
but it will work.
It is a simple matter to mould plastic into the shape of
a diver or an octopus or some such once you have it calibrated
and then drop it into a screw top coke bottle.

--
Wayne Watson (Nevada City, CA)

Web Page: <speckledwithStars.net>

Androcles wrote:

=20
"Uncle Al" <UncleAl0@hate.spam.net> wrote in message =

"W. Watson" wrote:

Are there any inexpensive devices that can be used to measure =

inside an enclosed but transparent container like a bottle?

Androcles is a Fermi surface of stooopidity.

=20
http://www.androcles01.pwp.blueyonder.co.uk/Morons/UncleStooopid.htm

=20
Hey critic troll=20