A gas (density = 1.5 kg/m<sup>3</sup>, viscosity = 2 × 10<sup>-5</sup> kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m<sup>3</sup> and viscosity of 3 × 10<sup>-5</sup> kg/m.s flowing at 3 m/s will be

Correct Answer: 12600 Pa/m