553.5 g/kg = 556.212 PSU
| g/kg | PSU |
|---|---|
| 538.5 g/kg | 541.139 |
| 543.5 g/kg | 546.163 |
| 548.5 g/kg | 551.188 |
| 553.5 | 556.212 |
| 558.5 g/kg | 561.237 |
| 563.5 g/kg | 566.261 |
| 568.5 g/kg | 571.286 |
553.5 g/kg = 556.212 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)