685.5 PSU = 682,157.4 mg/L
| PSU | mg/L |
|---|---|
| 670.5 PSU | 667,230.6 |
| 675.5 PSU | 672,206.2 |
| 680.5 PSU | 677,181.8 |
| 685.5 PSU | 682,157.4 |
| 690.5 PSU | 687,133 |
| 695.5 PSU | 692,108.7 |
| 700.5 PSU | 697,084.3 |
685.5 PSU = 682,157.4 mg/L
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)