646.5 mg/L = 646.5 ppm
| mg/L | ppm |
|---|---|
| 631.5 mg/L | 631.5 |
| 636.5 mg/L | 636.5 |
| 641.5 mg/L | 641.5 |
| 646.5 | 646.5 |
| 651.5 mg/L | 651.5 |
| 656.5 mg/L | 656.5 |
| 661.5 mg/L | 661.5 |
646.5 mg/L = 646.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm