391.5 g/kg = 393.418 PSU
| g/kg | PSU |
|---|---|
| 376.5 g/kg | 378.345 |
| 381.5 g/kg | 383.369 |
| 386.5 g/kg | 388.394 |
| 391.5 | 393.418 |
| 396.5 g/kg | 398.443 |
| 401.5 g/kg | 403.467 |
| 406.5 g/kg | 408.492 |
391.5 g/kg = 393.418 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)