From: Hamren, Bruce (Bruce.Hamren@athenian.org)
Date: Tue Oct 22 2002 - 11:07:33 PDT
Subject: RE: Pinhole Digest #1042 - 10/22/02 Date: Tue, 22 Oct 2002 11:07:33 -0700 Message-ID: <38F6498F846FDC468C57D22E54064611089894@TASMS01.athenian.org> From: "Hamren, Bruce" <Bruce.Hamren@athenian.org>
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
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----------------------------------------------------------------------
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 > ------------------------------------------------------------------------ --- > > >
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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
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