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A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the1.6 m radius of the balloon. Theballoon is filled with helium (He) at a temperature of 300 K and just floats in air, neither rising norfalling. The density of the surrounding air is 1.19kg/m3. Find the absolute pressure of the helium gas.

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