ppm和ppb定义为:
1ppm = 1/10 6 = 10 -6
1ppb = 1/10 9 = 10 -9
所以
1ppm = 1000ppb
百万分之几x ppm等于十亿分之几x ppb除以1000:
x ppm = x ppb / 1000
示例:7000ppb等于7ppm:
x ppm = 7000ppb / 1000 = 7ppm
ppb | ppm |
---|---|
1 | 0.001 |
10 | 0.01 |
100 | 0.1 |
1000 | 1 |
10000 | 10 |
100000 | 100 |
1000000 | 1000 |