309.5 mg/L = 309.5 ppm
| mg/L | ppm |
|---|---|
| 294.5 mg/L | 294.5 |
| 299.5 mg/L | 299.5 |
| 304.5 mg/L | 304.5 |
| 309.5 | 309.5 |
| 314.5 mg/L | 314.5 |
| 319.5 mg/L | 319.5 |
| 324.5 mg/L | 324.5 |
309.5 mg/L = 309.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm