658.5 PSU = 655,289.1 mg/L
| PSU | mg/L |
|---|---|
| 643.5 PSU | 640,362.2 |
| 648.5 PSU | 645,337.8 |
| 653.5 PSU | 650,313.5 |
| 658.5 PSU | 655,289.1 |
| 663.5 PSU | 660,264.7 |
| 668.5 PSU | 665,240.3 |
| 673.5 PSU | 670,215.9 |
658.5 PSU = 655,289.1 mg/L
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)