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Dear Jeff,
Speaking as someone who has done many liquid nitrogen experiments, I
don't know how much I would trust those statements. I agree that if I
were making as statement about 'liquid air', I would want to specify the
composition of air and list the boiling points of each gas, mentioning
that in order to make Earth's air a liquid state of matter, we would
have to get it colder than it's coldest component.
As to seeing it and what it looks like, I believe that I have and you
may have too- simply get a clear balloon, blow it up, tie it and place
it in a bowl of liquid nitrogen. Once the gas in the balloon has
condensed, pull it out with a pair of tongs. You will see a tiny puddle
in the balloon that was the gas you just put in there. If you were to do
this for guests, I would suggest using a flashlight to shine through the
balloon as you are holding it up so that the puddle is more visible.
Good luck with your exhibit!
Stephanie Kazmierzak-Esler
Science Interpreter
Orlando Science Center
ph: 407.514.2167
fax: 407.514.2067
Inspire Science Learning for Life
-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]] On Behalf Of Jeff Rosenblatt
Sent: Wednesday, July 11, 2012 10:52 AM
To: [log in to unmask]
Subject: Verifying Facts
ISEN-ASTC-L is a service of the Association of Science-Technology
Centers Incorporated, a worldwide network of science museums and related
institutions.
************************************************************************
*****
I'm trying to verify some facts another department has printed up from
various internet sources. I can't seem to get past, or find good
verification, of these two statements:
'Air becomes liquid at about minus 190 degrees Celsius.' (for clarity,
wouldn't a gas composing air need to be specified, like nitrogen at -196
C) 'Liquid air looks like water with a bluish tint.' (this confuses me,
as I always thought of air as a 'fluid,' unless this is in reference to
liquid oxygen or liquid nitrogen) Would anybody print up these
statements and put them in their science center or museum? Thanks for
any input.
--Jeff--
Jeff Rosenblatt
Director, Science City
Union Station Kansas City, Inc.
30 W. Pershing Rd. Suite 400
Kansas City, MO 64108
Office: 816-460-2218
[log in to unmask]<mailto:[log in to unmask]>
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