666.5 PSU = 663,250.1 mg/L
| PSU | mg/L |
|---|---|
| 651.5 PSU | 648,323.2 |
| 656.5 PSU | 653,298.8 |
| 661.5 PSU | 658,274.5 |
| 666.5 PSU | 663,250.1 |
| 671.5 PSU | 668,225.7 |
| 676.5 PSU | 673,201.3 |
| 681.5 PSU | 678,176.9 |
666.5 PSU = 663,250.1 mg/L
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)