A cylindrical tank containing water of density 1000 kg/m³ is filled to a height of 0.70 meters and placed on a stand as shown in the cross section above. A hole of radius 0.0010 meters in the bottom of the tank is opened. Water then flows through the hole and through an opening in the stand and is collected in a tray 0.30 meters below the hole. At the same time, water is added to the tank at an appropriate rate so that the water level in the tank remains constant.