A spherical balloon is made from a material whose mass is 2.33 kg.The thickness of the material is negligible compared to the 1.77-mradius of the balloon. The balloon is filled with helium (He) at atemperature of 283 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.