A gas mask has a filter consisting of spherical particles of gas adsorbent with diameter 3mm. The filter is cylindrical, with a diameter of 50mm and a thickness of 50mm. Assume that the wearer breathes in 1 liter of air in 1 second. The air has a density of 1.2kg/m3 and viscosity 1.8105Pas. The filter has a porosity of 0.4 . Calculate: - the Reynolds number of the air flow through the filter - the pressure gradient of the air in the filter - the pressure drop of the air in the filter. - Is the pressure drop dominated by laminar (viscous) forces or turbulent forces