Non-rigid airships known as blimps have occasionally been used for transportation. A blimp is essentially a balloon of volume V filled with helium. The blimp experiences a buoyancy force F = (ρ_atm − ρ_He)V_g, where ρ_atm is the density of the surrounding air and g ≅ 9.8m/s². The blimp maintains its shape because the pressure of the helium p_He is kept higher than the pressure of the surrounding atmosphere p_atm. A modern blimp with a volume V = 5740m³ can lift a total mass m = 5825 kg at temperature 0 ^◦C and p_atm = 1 atm. Assuming both air and helium behave as ideal gases, estimate the pressure of the helium gas inside the blimp. Assuming the blimp’s volume is kept constant, how much mass can it lift at 20 ^◦C?