657.5 mg/L = 657.5 ppm
| mg/L | ppm |
|---|---|
| 642.5 mg/L | 642.5 |
| 647.5 mg/L | 647.5 |
| 652.5 mg/L | 652.5 |
| 657.5 | 657.5 |
| 662.5 mg/L | 662.5 |
| 667.5 mg/L | 667.5 |
| 672.5 mg/L | 672.5 |
657.5 mg/L = 657.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm