1) PEG400 osmotic pressure vs. molality at different temperatures
Please use the following reference when using this data.
Reference - https://doi.org/10.1002/pro.4573. Osmotic pressure was calculated from the water activity data in table S4.
| Wt% | 15 degrees C | 20 degrees C | 25 degrees C | 35 degrees C | 45 degrees C |
| 5 | 3.69 | 3.74 | 3.65 | 3.70 | 3.71 |
| 10 | 8.55 | 8.52 | 8.17 | 8.24 | 8.23 |
| 15 | 14.9 | 14.7 | 13.8 | 13.9 | 13.8 |
| 20 | 23.2 | 22.6 | 21.0 | 21.0 | 21.0 |
| 25 | 34.0 | 32.8 | 30.2 | 30.0 | 30.0 |
| 30 | 48.1 | 45.9 | 42.0 | 41.5 | 41.2 |
| 35 | 66.7 | 63.1 | 57.3 | 56.4 | 55.6 |
| 40 | 91.9 | 86.3 | 77.7 | 76.2 | 74.8 |
| 45 | 125 | 117 | 104 | 102 | 99.6 |
| 50 | 172 | 159 | 141 | 137 | 133 |
2) PEG400 Osmotic pressure data (atm)
Reference - see Peter Rand.
wt% log P (dynes/cm^2)
2.5 6.3
5 6.55
10 6.93
15 7.14
20 7.33
25 7.5
30 7.65
An equation that fits this data is the following.
log P = a + b * (wt%) ^ c where a = 5.29, b = 0.73 and c = 0.34
Note that it should be applied only over the range of pressures measured.