Question 1 Terminal settling velocity of dust particles. Calculate the terminal settling velocity of dust particles having a diameter of 60 μm in air at 294.3 K and 101.32 kPa. The dust particles can be considered spherical with a density of 1280 kg/m³. Answer: u₁ = 0.1372 m/s Question 5 Settling velocity of liquid particles. Oil droplets having a diameter of 2 mm are settling from still air at 294.3 K and 101.32 kPa. The density of the oil is 900 kg/m³. A settling chamber is 0.457 m high. Calculate the terminal settling velocity. How long will it take for the particles to settle.