Particularly the fibrillating gas is {TAIL ~ a gaseous material} such as air, nitrogen, {HEAD ~ steam}, etc 
Particularly the fibrillating gas is { TAIL ~ a gaseous material } such as air , nitrogen , { HEAD ~ steam } , etc
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH