Density ratio vs. ambient: 1.89/1.18 = 1.60 → 60% more air.
Kael derived the energy balance: Total exhaust energy = Energy to turbine + Energy bypassed + Waste heat + Entropy. turbo physics grade 12 pdf
Without turbo, ambient air density was 1.18 kg/m³. Density ratio = 1.56/1.18 = 1.32 → 32% more air molecules. Density ratio vs