> High School Biology-Chemistry SMILE Meeting
09 December 2003
Notes Prepared by Porter Johnson

Marva Anyanwu [Wendell Green Elementary School]        Surface Tension of Water, continued!
passed around information on Surface Tension obtained from the GSU HyperPhysics websites [http://hyperphysics.phy-astr.gsu.edu/hbase/surten.html and http://hyperphysics.phy-astr.gsu.edu/hbase/surten2.html].  In particular, there were paragraphs on Surface Tension and Bubbles, Bubble Pressure, Surface Tension of Water, and  Cohesion and Adhesion  She also passed around information from the website (German) Messtechnik GmbH® [http://www.online-tensiometer.com/], concerning Surface Tension Experiments [http://physics.about.com/od/physicsexperiments/a/surfacetension_4.htm], including Water Hill and The Strength of Soap. We continued the study of bubbles from the last SMILE meeting [bc120203.html], and discussed their meaning. We learned that the pressure inside a bubble is slightly greater than outside atmospheric pressure, because of the effect of surface tension to produce a "wall tension".  Also, bubbles assume spherical shapes to minimize that "wall tension". The result also applies when a bubble is surrounded by a liquid, such as in the alveoli of the lungs.  The properties of cell membranes determine the shape of cells inside living organisms, for similar reasons.  Thanks Marva! Quite interesting.

Brenda Daniel  [Fuller Elementary School]         Science Fair Materials + Scavenger Hunt
passed around an educators MAP and other information obtained from the Museum of Science and Industry in Chicago [http://www.msichicago.org/]. Using this information, she led us through two distinct exercises:

Very thought-provoking! Thanks, Brenda.

Notes taken by Benjamin Stark