138.5 g/kg = 139.179 PSU
| g/kg | PSU |
|---|---|
| 123.5 g/kg | 124.105 |
| 128.5 g/kg | 129.13 |
| 133.5 g/kg | 134.154 |
| 138.5 | 139.179 |
| 143.5 g/kg | 144.203 |
| 148.5 g/kg | 149.228 |
| 153.5 g/kg | 154.252 |
138.5 g/kg = 139.179 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)