521.5 g/kg = 524.055 PSU
| g/kg | PSU |
|---|---|
| 506.5 g/kg | 508.982 |
| 511.5 g/kg | 514.006 |
| 516.5 g/kg | 519.031 |
| 521.5 | 524.055 |
| 526.5 g/kg | 529.08 |
| 531.5 g/kg | 534.104 |
| 536.5 g/kg | 539.129 |
521.5 g/kg = 524.055 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)