424.5 g/kg = 426.58 PSU
| g/kg | PSU |
|---|---|
| 409.5 g/kg | 411.507 |
| 414.5 g/kg | 416.531 |
| 419.5 g/kg | 421.556 |
| 424.5 | 426.58 |
| 429.5 g/kg | 431.605 |
| 434.5 g/kg | 436.629 |
| 439.5 g/kg | 441.654 |
424.5 g/kg = 426.58 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)