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A spherical balloon is made from a material whose mass is 3.86 kg. The thickness of the material is negligible compared to the 2.16-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 286 K and just floats in air, neither rising nor falling. The density of the surrounding air is 1.19 kg/m3. Find the absolute pressure of the helium gas.

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