polyethylene glycol MW 3000

wt%		log P (dynes/cm^2)

10.0		6.26
15.0		6.61
20.0		6.84
25.0		7.07
30.0		7.28
35.0		7.46

An equation that fits this data is the following.

log P = a + b * (wt%) ^ c

where a = 4.42, b = 0.74 and c = 0.40

Note that it should be applied only over the range of pressures measured.