浓度（摩尔）是每升溶液的摩尔数量的度量，通常以每升摩尔（mol/l）测量。
1 ppb = 0.001 mg/L
1 mg/L = 1,000 ppb
例子:
将15 零件十亿转换为每升毫克：
15 ppb = 0.015 mg/L
| 零件十亿 | 每升毫克 |
|---|---|
| 0.01 ppb | 1.0000e-5 mg/L |
| 0.1 ppb | 0 mg/L |
| 1 ppb | 0.001 mg/L |
| 2 ppb | 0.002 mg/L |
| 3 ppb | 0.003 mg/L |
| 5 ppb | 0.005 mg/L |
| 10 ppb | 0.01 mg/L |
| 20 ppb | 0.02 mg/L |
| 30 ppb | 0.03 mg/L |
| 40 ppb | 0.04 mg/L |
| 50 ppb | 0.05 mg/L |
| 60 ppb | 0.06 mg/L |
| 70 ppb | 0.07 mg/L |
| 80 ppb | 0.08 mg/L |
| 90 ppb | 0.09 mg/L |
| 100 ppb | 0.1 mg/L |
| 250 ppb | 0.25 mg/L |
| 500 ppb | 0.5 mg/L |
| 750 ppb | 0.75 mg/L |
| 1000 ppb | 1 mg/L |
| 10000 ppb | 10 mg/L |
| 100000 ppb | 100 mg/L |
规则