... at 25 "C for 30 min. surface volume ratio increased from 0.72 cm-I in the unpacked cell to 18.4cm-' when the packing was present. ... 1 > Page 5. 848 CANADIAN JOURNAL OF CHEMISTRY. VOL. 50, 1972 ... 6150 Torr SF, added. 11 150 Torr 2-rnethylpentane added. ...