Mass of the aeroplane, m=4.5×104kg Total wing area, A=600m2 Acceleration due to gravity, g=10m∕s2 The aeroplane is travelling at a constant height, meaning lift = weight. Step 1. Lift = Pressure difference × Area L=∆P×A Step 2. Lift = Weight L=mg So, ∆P×A=mg Step 3. Solve for pressure difference ∆P=‌