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Is the buoyancy defined by the density of the gas inside a balloon multiplied by the volume of the balloon and multiplied by the gravitational acceleration?

Or

Is the buoyancy defined by the density of the air surrounding the balloon multiplied by the volume of the balloon and multiplied by the gravitational acceleration?

When calculating the buoyancy of a balloon, do you use the density of the gas inside the balloon or the density of the air surrounding it?