ppm和ppt的定义如下：
1ppm = 1/106 = 10-6
1ppt = 1/1012 = 10-12
所以
1ppm = 106ppt
万亿分之一 xppt 等于百万分之一 xppm 乘以 106:
xppt = xppm 106
示例：7ppm等于7000ppb：
xppt = 7ppm 106 = 7000000ppt
| ppm | ppt |
|---|---|
| 0.000001 | 1 |
| 0.00001 | 10 |
| 0.0001 | 100 |
| 0.001 | 1000 |
| 0.01 | 10000 |
| 0.1 | 100000 |
| 1 | 106 |
| 10 | 107 |
| 100 | 108 |
| 1000 | 109 |
| 10000 | 1010 |
