280.5 g/kg = 281.874 PSU
| g/kg | PSU |
|---|---|
| 265.5 g/kg | 266.801 |
| 270.5 g/kg | 271.825 |
| 275.5 g/kg | 276.85 |
| 280.5 | 281.874 |
| 285.5 g/kg | 286.899 |
| 290.5 g/kg | 291.923 |
| 295.5 g/kg | 296.948 |
280.5 g/kg = 281.874 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)