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I watched a demo where this guy had smoke coming out of 2 chimneys and they were connected at the bottom. Under one chimney he had a candle flame, and then he covered both chimneys and let smoke build up and then uncovered the chimneys and the smoke fell down one and went out the one with the candle flame. Could this be done with a buoyant object in water? If I submerged and object that normally floated but then I heated water above it could I make it stay there. I know that might sound crazy or could I maybe do this with a balloon in air?