217.5 g/kg = 218.566 PSU
| g/kg | PSU |
|---|---|
| 202.5 g/kg | 203.492 |
| 207.5 g/kg | 208.517 |
| 212.5 g/kg | 213.541 |
| 217.5 | 218.566 |
| 222.5 g/kg | 223.59 |
| 227.5 g/kg | 228.615 |
| 232.5 g/kg | 233.639 |
217.5 g/kg = 218.566 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)