From: Joe Leet (jleet@prodigy.net)
Date: Sun Nov 24 2002 - 11:11:55 PST
Message-ID: <00b701c293ed$5b1796c0$4437e8d1@preferred-user> From: "Joe Leet" <jleet@prodigy.net> Subject: Re: Pinhole Digest #1069 - 11/24/02 Date: Sun, 24 Nov 2002 11:11:55 -0800
I have a question about a chemical reaction that I am hoping someone can
help me with.
On Friday, a collegue of mine tried to make soap in his classroom. For the
most part it was a success, except he did not tell his students not to use
any sort of metal as the mold for their soaps. One of his students did
indeed use an aluminum pie tin for this.
It created a pretty nasty reaction. I was called down to help him get all
of his students out of the classroom because the air had become impossible
to breathe.
Our concern is what exactly was produced that filled the air when the NaOH
reacted with the aluminum pie tin?
Thanks a lot.
Joe
-----Original Message-----
From: Pinhole Listserv <pinhole@exploratorium.edu>
To: Pinhole Listserv <pinhole@exploratorium.edu>
Date: Saturday, November 23, 2002 11:20 PM
Subject: Pinhole Digest #1069 - 11/24/02
Pinhole Digest #1069 - Sunday, November 24, 2002
One More Pressure Meter
by <SFPhysics@aol.com>
bed of nails
by "Mark Lawton" <markslawton@hotmail.com>
Project STAR spectrometers etc.
by "Marc Afifi" <marc_afifi@yahoo.com>
re: Leonids visited
by "Ronald Wong" <ronwong@inreach.com>
----------------------------------------------------------------------
Subject: One More Pressure Meter
From: <SFPhysics@aol.com>
Date: Sat, 23 Nov 2002 14:37:55 EST
Opps! I forgot one of the most easy ways of measuring lower pressures in a
bell jar. Use a ground glass medical syringe. Lubricate the plunger with a
small amount of vacuum oil so it will move freely. Leave a small measured
amount of air in the bottom and seal the sryinge opening with a bit of
modeling clay. Stand it vertical so the plunger is up using a wood block.
(A Boyle's Law demonstrator from the Physics lab will work just fine.) If
you have measured the weight of the plunger and computed the area of the
plunger then you may compute the equilibrium pressure as the plunger rises
while air is removed from the bell jar. This is just a variation of the
Boyle's Law demo.
Best wishes to everyone,
Al Sefl
Using osmosis to brine the turkey... umm - ummm good!
----------------------------------------------------------------------
Subject: bed of nails
From: "Mark Lawton" <markslawton@hotmail.com>
Date: Sat, 23 Nov 2002 12:01:59 -0800
marc,
one of the teachers in the ti (summer 01) did the nail demo and prepared
instructions. presumably the instructions are on file somewhere at the
exploratorium. i'm pretty sure that the teacher was named jack and that he
taught in sf.
perhaps you can get his email from the exploratorium folks.
-mark
> Subject: bed of nails construction
> From: "Marc Crown" <mcrown@gwhs.org>
> Date: Fri, 22 Nov 2002 09:19:31 -0800
>
> I'm trying to build a bed of nails for the classic demo but I can't
> find any instructions online. I have a basic idea but i would like to
> avoid time wasting mistakes. Has anyone seen it listed anywhere?
>
> thanks
----------------------------------------------------------------------
Subject: Project STAR spectrometers etc.
From: "Marc Afifi" <marc_afifi@yahoo.com>
Date: Sat, 23 Nov 2002 14:53:22 -0800 (PST)
Here's a link to the entire product line. You can buy
a cardboard version of the spectrometer as a
do-it-yourself kit that comes in a ten-pack for
$55.00. The students really like building the device
and then using it. All you need is a glue gun and a
screwdriver.
I really like their diffraction gratings.
Hope this helps.
-M
http://www.starlab.com/pspi.html
=====
Marc Afifi
Chemistry, Physics, Algebra 1B
Pacific Grove High School
Pacific Grove, CA
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----------------------------------------------------------------------
Subject: re: Leonids visited
From: "Ronald Wong" <ronwong@inreach.com>
Date: Sat, 23 Nov 2002 17:47:27 -0800
>We did it! We had a wonderful time, even with the almost full moon blinding
>us, ha! We did a count from 2:40 - 2:50 and will send that to NASA. We are
>going to write more later on Ale's site.
>
>
>... for those of you who were watching in the wee hours, what planet
>was that in the eastern sky?
Sue,
I'm surprised nobody answered your question by now.
At this time of year, you can see both Saturn and Jupiter in the night sky
in the wee hours.
Since it's closer to the sun (heliocentric)/earth (geocentric), Jupiter's
eastern progression against the background of the stars is greater than
Saturn's. Presently, it's East of Saturn and, from year to year, it will
appear further east of Saturn early in the morning at this time of year.
Tuesday morning at 2:00 AM, Saturn was around 40 degrees East of the moon
and Jupiter, 90 degrees. So, you should have seen two planets if the sky
was clear.
ron
----------------------------------------------------------------------
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