550.5 g/kg = 553.197 PSU
| g/kg | PSU |
|---|---|
| 535.5 g/kg | 538.124 |
| 540.5 g/kg | 543.148 |
| 545.5 g/kg | 548.173 |
| 550.5 | 553.197 |
| 555.5 g/kg | 558.222 |
| 560.5 g/kg | 563.246 |
| 565.5 g/kg | 568.271 |
550.5 g/kg = 553.197 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)