The Experiment
The Results
This one didn't quite go according to plan. Further viewing on the Interweb has shown that everyone else seems to do it inside. Maybe the draft or the cold weather affected it.
The Science
The principle is similar to a hot air balloon. The burning top of the cylinder of paper heats the air, which rises up allowing the denser, cooler air to push in from the bottom. This convection current allows the lightweight ashy residue of the bag to fly into the air.
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