ppm和ppb定义为:
1ppm = 1/106 = 10-6
1ppb = 1/109 = 10-9
所以
1ppm = 1000ppb
每百万分之几x ppm等于十亿分之几x ppb除以1000:
xppm = xppb / 1000
例如:7000ppb等于7ppm:
xppm = 7000ppb / 1000 = 7ppm
ppb | 百万分之几 |
---|---|
1个 | 0.001 |
10 | 0.01 |
100 | 0.1 |
1000 | 1个 |
10000 | 10 |
100000 | 100 |
1000000 | 1000 |
.