In order to facilitate comparison of {HEAD ~ various materials}, this value can be multiplied by the bulk density of {TAIL ~ the material} in grams per cc resulting in a surface area expressed as square meters per cc 
In order to facilitate comparison of { HEAD ~ various materials } , this value can be multiplied by the bulk density of { TAIL ~ the material } in grams per cc resulting in a surface area expressed as square meters per cc
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH