{TAIL ~ The first reaction chamber} is arranged in continuous fluid communication with the downstream conduit and has {HEAD ~ a preselected first effective surface area} 
{ TAIL ~ The first reaction chamber } is arranged in continuous fluid communication with the downstream conduit and has { HEAD ~ a preselected first effective surface area }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD