627.5 g/kg = 630.575 PSU
| g/kg | PSU |
|---|---|
| 612.5 g/kg | 615.501 |
| 617.5 g/kg | 620.526 |
| 622.5 g/kg | 625.55 |
| 627.5 | 630.575 |
| 632.5 g/kg | 635.599 |
| 637.5 g/kg | 640.624 |
| 642.5 g/kg | 645.648 |
627.5 g/kg = 630.575 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)