490.5 g/kg = 492.903 PSU
| g/kg | PSU |
|---|---|
| 475.5 g/kg | 477.83 |
| 480.5 g/kg | 482.854 |
| 485.5 g/kg | 487.879 |
| 490.5 | 492.903 |
| 495.5 g/kg | 497.928 |
| 500.5 g/kg | 502.952 |
| 505.5 g/kg | 507.977 |
490.5 g/kg = 492.903 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)