290.5 mg/L = 290.5 ppm
| mg/L | ppm |
|---|---|
| 275.5 mg/L | 275.5 |
| 280.5 mg/L | 280.5 |
| 285.5 mg/L | 285.5 |
| 290.5 | 290.5 |
| 295.5 mg/L | 295.5 |
| 300.5 mg/L | 300.5 |
| 305.5 mg/L | 305.5 |
290.5 mg/L = 290.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm