How must the average density of a helium balloon be changed to make it rise, float at a constant level, and sink in air?
At sea lever, the average density of the air is equal to 1.225 kilograms per cubed meter (0.0765 lb/cu ft). In order for a helium balloon to rise, it's density must be less than this, to float equal to this, and to sink greater than this. ChaCha!
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