581.5 g/kg = 584.349 PSU
| g/kg | PSU |
|---|---|
| 566.5 g/kg | 569.276 |
| 571.5 g/kg | 574.3 |
| 576.5 g/kg | 579.325 |
| 581.5 | 584.349 |
| 586.5 g/kg | 589.374 |
| 591.5 g/kg | 594.398 |
| 596.5 g/kg | 599.423 |
581.5 g/kg = 584.349 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)