Ice Balloons Activity
By Paul Doherty
Friday, December 21, 2007 · 
2 comments
2 comments 
Paul Doherty is a physicist, teacher, author, and rock climber with a Ph.D. in solid-state physics from the Massachusetts Institute of Technology (1974). As a tenured professor at Oakland University, he taught a wide range of science courses, including physics, astronomy, geology, electronics, computer programming, and meteorology. In 1986, he came to the Exploratorium Teacher Institute and began his exhibit-based explorations in science. As an author, he has written over two dozen articles for Exploring magazine, and has co-authored the Exploratorium Science Snackbook, the Klutz Book of Magnetic Magic, and the book, Traces of Time. For musical entertainment, he plays the whirly--a corrugated plastic tube. He has won several competitions, including an award as "Best Science Demonstrator" at the World Congress of Museums in Helsinki in 1996. He is about to finish his third decade as a rock climber. In 2000 he made the first ascent of a 20,000 foot peak in the Andes.
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Hi
I am a science technician and I have made ice balloons for several years. Occasionally they get left in the freezer and when I look at them they have deep grooves in them, please help me to understand why.
many thanks
Gill
Enjoyed it! Still like science, but never had your boyant enthusiasm,