Description: A flask containing a small amount of boiling water is sealed with a balloon over its mouth. As the flask cools, the balloon is drawn into the flask.

This demonstration is also available on video and JCE "Chemistry Comes Alive!" Vol. 2 CD-Rom.

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Source: Institute for Chemical Education, Fun With Chemistry; A Guidebook of K-12 Activities. vol 1

Year or vol: 1991 page 155