ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
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I'd be interested in this as well.

Other Bernoulli phenomena I've seen done well:

A ping pong ball captured in a tube - blow air across the top of the tube,
the ball rises.
I believe Arizona Science Center did this one along with the blowing air
between two balls to cause them to come together.

Blowing horizontally across the top of a sheet with one end of an air hose
lifts the rest of the sheet.

Put a ping pong ball in the opening of a funnel, blow air through it and
turn it upside down.  The ball remains floating in the funnel.
One museum had a decent example of this:  they had air blowing down, you
put a square piece of plastic (or foam - can't remember for sure) in front
of the pipe that blew down.  The air actually kept the square piece
floating - pinned to the top - quite cool, but I think most people probably
didn't follow the instructions and put the square piece right against the
downward air outlet (it doesn't work if you don't do this).  I may have
seen this one in Durham Museum of life and science.

Also for examples of Venturi principles, and other fluid flow phenomena you
can blow tube through a pipe with multiple (2 or 3 or actually more if you
insist) openings and drop foam balls in one opening.  Then experiment with
capping the different openings. Airplay (by Montshire, marketed by ASTC)
has a good version of this.

As a side note, does anyone know where to get some good foam balls or other
shapes for demonstrating these phenomena?  I love the idea of challenging
the misconception of the shape of the blower affecting which shape stayed
aloft...

-William


William Katzman                    "The important thing is to never stop
questioning." -A. Einstein
Director of Exhibits               "Are you sure about that Al?" -His wife.
Catawba Science Center
ph: (828) 322-8169 x307
fax:(828) 322-1585
[log in to unmask]

-----Original Message-----
From:   Andrea Stark [SMTP:[log in to unmask]]
Sent:   Monday, August 30, 2004 6:02 PM
Subject:        Bernouilli exhibits

ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related
institutions.
************************************************************************
*****

We'd like to make changes to our Bernouilli exhibit, which now consists
essentially of several small blowers that can be moved around to keep ping
pong balls in the air and/or "make a basket" with them.  Does anyone have
examples of more interesting exhibits that demonstrate Bernouilli's
principle or otherwise deal with air flow and could capture the attention
of
older visitors, yet be operable by younger visitors to our children's
museum?

Andrea Stark
Executive Director
Maine Discovery Museum
74 Main St., Bangor, ME 04401
207-262-7200; FAX: 207-947-6281

www.mainediscoverymuseum.org

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