821.5 mg/L = 821.5 ppm
| mg/L | ppm |
|---|---|
| 806.5 mg/L | 806.5 |
| 811.5 mg/L | 811.5 |
| 816.5 mg/L | 816.5 |
| 821.5 mg/L | 821.5 |
| 826.5 mg/L | 826.5 |
| 831.5 mg/L | 831.5 |
| 836.5 mg/L | 836.5 |
821.5 mg/L = 821.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm