138.5 mg/L = 138.5 ppm
| mg/L | ppm |
|---|---|
| 123.5 mg/L | 123.5 |
| 128.5 mg/L | 128.5 |
| 133.5 mg/L | 133.5 |
| 138.5 | 138.5 |
| 143.5 mg/L | 143.5 |
| 148.5 mg/L | 148.5 |
| 153.5 mg/L | 153.5 |
138.5 mg/L = 138.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm