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

This floating activity actually does work really well when the eggs are kept out of the refrigerator for at least a week or two so that enough of the internal liquid can evaporate. 

It's fun to take a bunch of different eggs labled with various dates, and suspend them at different levels in a tank of water. They only stink when they break:-)

If you do this along with egg candling, you can see that the shells are porous so that air can get into the egg and the liquid evaporate out. An egg candler can be easily made with a plastic flash light, card board tub (cut up paper towel roll) and duct tape.

Lynn Parrucci
Director of Education-Group Programs
Philadelphia Zoo
3400 W. Girard Avenue
Philadelphia, PA 19104
Phone:  215-243-5243
Fax:       215-243-5385
Email:  [log in to unmask]



-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]]On Behalf Of Kay Ziff
Sent: Wednesday, March 31, 2004 12:51 PM
To: [log in to unmask]
Subject: Re: egg science


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

According to my ancient Fanny Farmer cookbook only fresh eggs sink,
while eggs that are past their prime will float. So if you're brave
enough to risk working with rotten eggs, you can add another variable
to the float/sink experiment.
--
   Kay Ziff
   Exhibit Developer

   Bay Area Discovery Museum
   557 McReynolds Road
   Sausalito, Ca 94965
   Phone:  415/339-3922

***********************************************************************
More information about the Informal Science Education Network and the
Association of Science-Technology Centers may be found at http://www.astc.org.
To remove your e-mail address from the ISEN-ASTC-L list, send the
message  SIGNOFF ISEN-ASTC-L in the BODY of a message to
[log in to unmask]

***********************************************************************
More information about the Informal Science Education Network and the
Association of Science-Technology Centers may be found at http://www.astc.org.
To remove your e-mail address from the ISEN-ASTC-L list, send the
message  SIGNOFF ISEN-ASTC-L in the BODY of a message to
[log in to unmask]