MATERIALS NEEDED: two, small paper bags two pieces of thread, approx. 10" long tape wooden balance candle match STEPS TO FOLLOW: Open the bags. Use the tape to attach one end of string to each bag. Tie a loop on the free end of each string and hang from the ends of the balance rod. Move the bags along the ends of the rod until they are exactly balanced.

Click for QT movie. (283K) Click for QT movie. (82K) Light the candle and carefully heat the air below one of the bags. Wait a few minutes. Observe. (The bag above the candle rises.)

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Last modified: Tue Mar 24 18:51:24 PST 1998

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