178.5 g/kg = 179.375 PSU
| g/kg | PSU |
|---|---|
| 163.5 g/kg | 164.301 |
| 168.5 g/kg | 169.326 |
| 173.5 g/kg | 174.35 |
| 178.5 | 179.375 |
| 183.5 g/kg | 184.399 |
| 188.5 g/kg | 189.424 |
| 193.5 g/kg | 194.448 |
178.5 g/kg = 179.375 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)