251.5 g/kg = 252.732 PSU
| g/kg | PSU |
|---|---|
| 236.5 g/kg | 237.659 |
| 241.5 g/kg | 242.683 |
| 246.5 g/kg | 247.708 |
| 251.5 | 252.732 |
| 256.5 g/kg | 257.757 |
| 261.5 g/kg | 262.781 |
| 266.5 g/kg | 267.806 |
251.5 g/kg = 252.732 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)