polyethylene glycol MW 10,000

wt%		log P (dynes/cm^2)

10.0		6.16
15.0		6.45
20.0		6.75
25.0		7.00
30.0		7.24
35.0		7.43

An equation that fits this data is the following.

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

where a = 4.99, b = 0.29 and c = 0.60

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