KyLabs
ppm和ppb定義為：
1ppm = 1/10 6 = 10 -6
1ppb = 1/10 9 = 10 -9
所以
1ppm = 1000ppb
每百萬分之幾x ppm等於每十億分之幾x ppb除以1000：
x ppm = x ppb / 1000
示例：7000ppb等於7ppm：
x ppm = 7000ppb / 1000 = 7ppm
ppm到ppb的轉換►