From: Hamren, Bruce (Bruce.Hamren@athenian.org)
Date: Wed Oct 23 2002 - 09:33:06 PDT
Subject: RE: Pinhole Digest #1043 - 10/23/02 Date: Wed, 23 Oct 2002 09:33:06 -0700 Message-ID: <38F6498F846FDC468C57D22E540646111C52AF@TASMS01.athenian.org> From: "Hamren, Bruce" <Bruce.Hamren@athenian.org>
Regarding source for purchase of ethanol:
Ethanol (denatured) can be purchased at ACE Hardware in a one gallon
can for about thirteen dollars.
-----Original Message-----
From: Pinhole Listserv [mailto:pinhole@exploratorium.edu]
Sent: Wednesday, October 23, 2002 12:20 AM
To: Pinhole Listserv
Subject: Pinhole Digest #1043 - 10/23/02
Pinhole Digest #1043 - Wednesday, October 23, 2002
Whosh Bottle - Vacuum Bell Jar - Safety
by <SFPhysics@aol.com>
Re: pinhole
by <wthwaite@llesd.k12.ca.us>
free Chemcom books
by "Geoff Ruth" <gruth@leadershiphigh.org>
RE: Pinhole Digest #1042 - 10/22/02
by "Hamren, Bruce" <Bruce.Hamren@athenian.org>
GIS Day Event
by "Paul Doherty" <pauld@exploratorium.edu>
Re: whoosh bottle
by "Deb Jensen" <deb@meer.net>
----------------------------------------------------------------------
Subject: Whosh Bottle - Vacuum Bell Jar - Safety
From: <SFPhysics@aol.com>
Date: Tue, 22 Oct 2002 05:05:46 EDT
Thanks Eric.
In reviewing the explosion in Bakersfield I suspect that the ambient lab
temperature may have been higher than usual causing the vapor pressure
of the
methyl alcohol (CH4O) to be higher and also accelerating the reaction.
Bakersfield in August can be in the low 100's Fahrenheit. The Chem
teacher
in my school used Ethanol (CH3CH2OH) with its lower vapor pressure and
slower
combustion rate in the San Francisco normally cool ambient temperatures.
The
smaller methyl molecule is too close to the fast combustion propane (or
methane) which I used for my potato canon in the ballistics
demonstrations
for me to be comfortable using it. Chem people please enlighten me if
my
thinking is flawed.
On any experiment that even remotely has the possibility of explosion or
implosion there should be adequate safety precautions. A quarter inch
mesh
wire screen purchased from a hardware store and made into a protective
cover
is what I used for all my bell jar vacuum demonstrations for 33 years
and was
lucky enough never to have an implosion. Today there is Lexan (the
trademark
of a bullet resistant polycarbonate acrylic) which could be placed in a
sturdy frame between the demonstration and the students. I got a sheet
from
the school district glaziers who were replacing broken windows and made
a
frame myself. That way I had the wire screen and the Lexan for those
last
few years. This was because my bell jar was very large and when
evacuated
had very great forces on it.
Lastly, anyone know where I may purchase a small quantity of Ethanol to
try
the experiment myself? No one will sell this to me now that I am a
common
citizen who is not connected to a school.
Best wishes to all,
Al Sefl
Retired but keeping busy...
----------------------------------------------------------------------
Subject: Re: pinhole
From: <wthwaite@llesd.k12.ca.us>
Date: Tue, 22 Oct 2002 08:14:32 -0800
Paul
I was thinking last night about the gas/liquid density issue.
Is there any way that a gas could be more dense than a liquid if maybe
it was under a lot of pressure? Like if you put a balloon filled with a
dense gas deep in the ocean, could you get to a spot that the pressure
was so great that the volume had decreased so much that the balloon
would begin to sink because it was now more dense than the water?
whitney
----------------------------------------------------------------------
Subject: free Chemcom books
From: "Geoff Ruth" <gruth@leadershiphigh.org>
Date: Tue, 22 Oct 2002 10:14:26 -0700
Lick-Wilmerding has a set of 24 brand new Chemcom books that they do
not plan on using. If you can use these in your class, please contact
Ravi Lau at "rlau@lwhs.org."
If you decide that you want the books, you must:
1) Provide a letter on school letterhead acknowledging receipt
2) Pay postage or arrange to come by and pick them up
----------------------------------------------------------------------
Subject: RE: Pinhole Digest #1042 - 10/22/02
From: "Hamren, Bruce" <Bruce.Hamren@athenian.org>
Date: Tue, 22 Oct 2002 11:07:33 -0700
I have noted that the whoosh bottle demos listed here involve the use of
five gallon water bottles. Interested teachers should try using one
gallon plastic milk jugs. They are dramatic and pose a much lower risk.
-----Original Message-----
From: Pinhole Listserv [mailto:pinhole@exploratorium.edu]
Sent: Tuesday, October 22, 2002 12:20 AM
To: Pinhole Listserv
Subject: Pinhole Digest #1042 - 10/22/02
Pinhole Digest #1042 - Tuesday, October 22, 2002
Ethyl Alcohol Whoose Bottle?
by <SFPhysics@aol.com>
Re: Burners and/or Torches
by "Raleigh McLemore" <raleighmclemore@yahoo.com>
(no subject)
by <wthwaite@llesd.k12.ca.us>
Whoosh bottle
by "Eric Muller" <emuller@isaac.exploratorium.edu>
Re: pinhole
by <pauld@exploratorium.edu>
Re: pinhole
by <NFetter@aol.com>
Re: pinhole Burners and/or Torches
by <NFetter@aol.com>
Re: pinhole Whoosh bottle
by <NFetter@aol.com>
----------------------------------------------------------------------
Subject: Ethyl Alcohol Whoose Bottle?
From: <SFPhysics@aol.com>
Date: Mon, 21 Oct 2002 04:56:12 EDT
Eric:
What is the correct way to safely do this experiment/demonstration? How
much
ethyl alcohol do you put into the bottle? I remember seeing this done
by a
first rate Chemistry teacher on many occassions but I never had the
courage
to try it.
Al Sefl
Whose contact with ethyl alcohol is generally a Glenlivet on the
rocks...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<< Thanks to Eric for a great set of mini-chemistry
lessons at the Exploratorium last Wednesday. He showed
us an incredible experiment using alcohol and an empty
plastic 5 gallon water bottle and a pretty nifty way
to teach balancing equations.
With firm handshake,
Raleigh
>>
----------------------------------------------------------------------
Subject: Re: Burners and/or Torches
From: "Raleigh McLemore" <raleighmclemore@yahoo.com>
Date: Mon, 21 Oct 2002 09:00:12 -0700 (PDT)
Eric warned us of exactly the dangers you mentioned,
especially using plastic containers. I didn't say
anything about the details but your cautions are very
important. Anything that looks that cool seems to
always be dangerous in some way. I teach elementary
school and I won't even be showing the demo to the
Kebler elves at my school for fear they will figure
out how I did it and inspire pyromania among the
little people. Putting a few strips of fiber tape
around the bottle seems to be a good idea. Eric had
us wear goggles while doing the experiment. Having
said all that the "whoosh" experiment, as you call it,
has gone to the top of the list of "most exciting,
simple demos" for me. Yeeha!
With firm handshake,
Raleigh
__________________________________________________
Do you Yahoo!?
Y! Web Hosting - Let the expert host your web site
http://webhosting.yahoo.com/
----------------------------------------------------------------------
Subject:
From: <wthwaite@llesd.k12.ca.us>
Date: Mon, 21 Oct 2002 10:29:33 -0800
Does anyone know if there is a gas that has a greater density than a
liquid?
l
----------------------------------------------------------------------
Subject: Whoosh bottle
From: "Eric Muller" <emuller@isaac.exploratorium.edu>
Date: Mon, 21 Oct 2002 11:40:27 -0700
>Thanks for the note Roy.
>Whoosh Bottle - info at
http://www.camp150.com/pastucha0171/KnoxDem08.html.
>
>Yeah, gotta be safe with this one. I mentioned many times
>(especially at this summer's workshop) you gotta use plastic
>containers for this demo. Good thought about replacing the bottle
>after awhile.
>
>I've been doing this demo for years and it always gets a great
>response, but you have to be safety conscience. Follow this link
>for a story of a mishap of this demo (they used glass)
>http://www.labsafety.org/news/bakersexp.htm.
>
>For anybody that wants to do this activity, please contact me.
>Don't practice it alone or try it for the first time in front of a
>classScome and see me first.
>-Eric "Blazo" Muller
-- Eric Muller Exploratorium Teacher Institute Science Educator 3601 Lyon St. San Francisco, CA 94123415-561-0386 emuller@exploratorium.edu
www.doscience.com
----------------------------------------------------------------------
Subject: Re: pinhole From: <pauld@exploratorium.edu> Date: Mon, 21 Oct 2002 13:27:31 US/Pacific
If you count the ionized gas inside the sun which is mostly hydrogen (a plasma) then yes it is 20 times denser than water.
Inside Jupiter hydrogen gas is compressed to a density greater than water. (Even deeper it is denser than rock on Earth)
On Earth, at the critical point, gas and liquid phases of one molecule approach the same density.
However I know of no gas you can get your hands on that is denser than any liquid you can acquire.
In general gas has the same number of molecules per unit volume at STP. So compared to air with mass 29 grams per mole ( 22.4 L at STP) which has a density 800 times less than most liquids you would need to find a gas at stp with a molecular mass 800 times greater than air. Or a molecular mass of about 24,000 grams per mole.
Paul D
> Does anyone know if there is a gas that has a greater density than a liquid? > > l > > ------------------------------------------------------------------------ --- > > To unsubscribe from pinhole, send an email to requests@exploratorium.edu > with the words 'unsubscribe pinhole' (without the quotes) in the SUBJECT > of the email. > > To subscribe to the digest and only get 1 combined message a day, send an > email to requests@exploratorium.edu with the words 'subscribe digest > pinhole' (without the quotes) in the SUBJECT of the email. > > Check out what your colleagues have written on Pinhole in the Pinhole > archives at: http://saturn.exploratorium.edu/ti/alumni/pinhole.html > ------------------------------------------------------------------------ --- > > >
-------------------------------------------------- This message was sent using Exploratorium web mail http://www.exploratorium.edu/
----------------------------------------------------------------------
Subject: Re: pinhole From: <NFetter@aol.com> Date: Tue, 22 Oct 2002 01:00:09 EDT
Hi paul, What is the density of uranium hexaflouride? Is it greater than ethanol? Neil
----------------------------------------------------------------------
Subject: Re: pinhole Burners and/or Torches From: <NFetter@aol.com> Date: Tue, 22 Oct 2002 01:06:51 EDT
Hi Paul. I think the forces holding sugar molecules together are permanent dipole-dipole attractions and hydrogen bonds. Solid benzene, which is non-polar is held together by London interactions. The London forces are
sometimes stronger than the permenent dipole attractions. Neil
----------------------------------------------------------------------
Subject: Re: pinhole Whoosh bottle From: <NFetter@aol.com> Date: Tue, 22 Oct 2002 01:15:13 EDT
Hi Eric, The best "whoosh" bottle is made by sealing two nails on oppsite sides of a polyethylene reagent bottle so that they are about one centimeter apart. Put about 5 ml of METHANOL in the bottle and stick a rubber stopper firmly in the mouth. Bring a Tesla coil leak detector up to one of the nails and BOOM!. The rubber stopper will pop out of the bottle harmlessly if aimed upward. I have done this demo many times with same bottle with no problems except for an occasionly lost stopper. The nails can be sealed with silicone sealer. Neil Fetter
---------------------------------------------------------------------- End of Pinhole Digest
------------------------------------------------------------------------ --- To unsubscribe from pinhole, send an email to requests@exploratorium.edu with the words 'unsubscribe pinhole' (without the quotes) in the SUBJECT of the email.
To subscribe to the digest and only get 1 combined message a day, send an email to requests@exploratorium.edu with the words 'subscribe digest pinhole' (without the quotes) in the SUBJECT of the email.
Check out what your colleagues have written on Pinhole in the Pinhole archives at: http://saturn.exploratorium.edu/ti/alumni/pinhole.html ------------------------------------------------------------------------ ---
----------------------------------------------------------------------
Subject: GIS Day Event From: "Paul Doherty" <pauld@exploratorium.edu> Date: Tue, 22 Oct 2002 12:26:43 -0700
>Subject: GIS Day Event >To: Paul Doherty <pauld@exploratorium.edu> >From: BASA - Liz Colvard <ecolvard@usgs.gov> >Date: Tue, 22 Oct 2002 08:58:22 -0700 >X-MIMETrack: Serialize by Router on gscamnlm01/SERVER/USGS/DOI(Release >5.0.10 |March 22, 2002) at > 10/22/2002 08:58:18 AM >MIME-Version: 1.0 >Cc: >Reply-To: BASA <basa.82265@email.edgateway.net> > >From: BASA - Liz Colvard >Replies to this message go to the whole group. > >GIS Day Event >The U.S. Geological Survey (USGS), the Bay Area Automated Mapping >Association (BAAMA), and the American Society for Photogrammetry and Remote >Sensing (ASPRS) are co-hosting a GIS Day event on November 20 from 4:00p - >8:00p at the USGS campus at 345 Middlefield Rd. in Menlo Park. > >This event is free and open to the public. Educators and older students >are especially encouraged to attend. Activities include a map contest and >gallery, a mini-workshop, information tables, technical tours of the USGS >geography facilities, free data CDs, an ice-cream social, and dynamic >speaker presentations. > >GIS, or Geographic Information Systems, is a technology that combines >layers of data about a place to provide a better understanding of that >place. GIS is part of our everyday lives. Users include city planners, >utility companies, police departments, farmers, and environmental managers. > >Map Contest! >Students and professionals of all ages are invited to create a map for our >GIS Day map/poster contest. Prizes include software, books, and more! The >maps will be displayed on the BAAMA website and some maps will also be >exhibited at the California GIS Conference in Palm Springs. For contest >rules and an entry form, see our web page at >http://wgsc.wr.usgs.gov/gisday2002/ > >For more information about our GIS Day activities, see >http://wgsc.wr.usgs.gov/gisday2002/ >or contact Liz Colvard at 650-329-4498 or ecolvard@usgs.gov. > > > > > > >--------------------------------------------------------------- >Respond directly to the sender of this message only. > mailto:ecolvard@usgs.gov > >Post a response to this message and send to the entire group. > mailto:basa.82265@email.edgateway.net > >Post a new message on a new topic and send to the entire group. > mailto:basa@email.edgateway.net > >To view this discussion online: > http://www.edgateway.net/cs/ege/forum/cs_disc/455 > >To unsubscribe and not receive further emails. > mailto:unsubscribe.basa@email.edgateway.net >
----------------------------------------------------------------------
Subject: Re: whoosh bottle From: "Deb Jensen" <deb@meer.net> Date: Tue, 22 Oct 2002 21:43:34 -0700
>>I've been doing this demo for years and it always gets a great >>response, but you have to be safety conscience. Follow this link >>for a story of a mishap of this demo (they used glass) >>http://www.labsafety.org/news/bakersexp.htm. >>
Sheesh. I thought it was bad when I grabbed the wrong end of a soldering iron in front of a whole class - this is much more exciting. <G>
I've done a demo similar to this with a Pringle's potato chip can and a Nerf ball. You stuff the ball in the open end of the can, and punch a hole about an inch up from the bottom end. Squirt in some methanol (can't remember how much, a few drops maybe?), give it a little time to vaporize, then light at the hole with a match (aimed away from your face). Nice "rocket launcher", and no one gets hurt by shredded cardboard if it blows up on the launchpad (I never saw one do this).
deb \m/
---------------------------------------------------------------------- End of Pinhole Digest
------------------------------------------------------------------------ --- To unsubscribe from pinhole, send an email to requests@exploratorium.edu with the words 'unsubscribe pinhole' (without the quotes) in the SUBJECT of the email.
To subscribe to the digest and only get 1 combined message a day, send an email to requests@exploratorium.edu with the words 'subscribe digest pinhole' (without the quotes) in the SUBJECT of the email.
Check out what your colleagues have written on Pinhole in the Pinhole archives at: http://saturn.exploratorium.edu/ti/alumni/pinhole.html ------------------------------------------------------------------------ ---
This archive was generated by hypermail 2.1.3 : Mon Aug 04 2003 - 16:18:07 PDT