491.5 g/kg = 493.908 PSU
| g/kg | PSU |
|---|---|
| 476.5 g/kg | 478.835 |
| 481.5 g/kg | 483.859 |
| 486.5 g/kg | 488.884 |
| 491.5 | 493.908 |
| 496.5 g/kg | 498.933 |
| 501.5 g/kg | 503.957 |
| 506.5 g/kg | 508.982 |
491.5 g/kg = 493.908 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)