dextran 10,000 MW wt% log P (dynes/cm^2) 14.7 5.92 20.8 6.18 23.4 6.38 30.2 6.59 34.2 6.85 An equation that fits this data is the following. log P = a + b * (wt%) ^ c where a = 4.52, b = 0.28 and c = 0.60 Note that it should be applied only over the range of pressures measured.