Sainmhínítear ppm agus ppb mar:
1ppm = 1/10 6 = 10 -6
1ppb = 1/10 9 = 10 -9
Mar sin
1ppm = 1000ppb
Tá líon na gcodanna-in aghaidh an mhilliúin x ppm cothrom le líon na gcodanna-in aghaidh an billiún x ppb arna roinnt ar 1000:
x ppm = x ppb / 1000
Sampla: Tá 7000ppb cothrom le 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 |
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