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Buoyancy of an oxygen-filled ball?
The air density is about 1.29Kg/m? Is the density of oxygen 1.429kg/m? .

The oxygen ball completely sinks into the air, so F float =G row.

Buoyancy formula: F float =G row = ρ liquid gV row. As long as the volume of the balloon is known, the calculation can get the result.

The above is just a simple calculation. The actual specific parameters are affected by temperature and pressure, and the results will be different.