The packing density is more preferably 0.6 1.3 kg/l. Herein, {HEAD ~ bulk volume} refers to {TAIL ~ an apparent volume} including any vacant space 
refers to
The packing density is more preferably 0.6 1.3 kg / l. Herein , { HEAD ~ bulk volume } refers to { TAIL ~ an apparent volume } including any vacant space
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH