438.5 g/kg = 440.649 PSU
| g/kg | PSU |
|---|---|
| 423.5 g/kg | 425.575 |
| 428.5 g/kg | 430.6 |
| 433.5 g/kg | 435.624 |
| 438.5 | 440.649 |
| 443.5 g/kg | 445.673 |
| 448.5 g/kg | 450.698 |
| 453.5 g/kg | 455.722 |
438.5 g/kg = 440.649 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)