409.5 g/kg = 411.507 PSU
| g/kg | PSU |
|---|---|
| 394.5 g/kg | 396.433 |
| 399.5 g/kg | 401.458 |
| 404.5 g/kg | 406.482 |
| 409.5 | 411.507 |
| 414.5 g/kg | 416.531 |
| 419.5 g/kg | 421.556 |
| 424.5 g/kg | 426.58 |
409.5 g/kg = 411.507 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)