An orifice meter is to be used to measure the flow rate of propyl alcohol at 25°C through a PVC plastic pipe, 40 mm OD x 3.0 mm wall. The expected range of flow rates is 1.0 m3 /h to 2.5 m3 /h. Specify the diameter for the orifice to obtain β = 0.40 and determine the range of readings for a mercury manometer for the given flow rates.