509.5 g/kg = 511.997 PSU
| g/kg | PSU |
|---|---|
| 494.5 g/kg | 496.923 |
| 499.5 g/kg | 501.948 |
| 504.5 g/kg | 506.972 |
| 509.5 | 511.997 |
| 514.5 g/kg | 517.021 |
| 519.5 g/kg | 522.046 |
| 524.5 g/kg | 527.07 |
509.5 g/kg = 511.997 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)