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 billiún x ppb cothrom le líon na gcodanna-in aghaidh an mhilliúin x ppm arna iolrú faoi 1000:
x ppb = x ppm ⋅ 1000
Sampla: Tá 7ppm cothrom le 7000ppb:
x ppb = 7ppm ⋅ 1000 = 7000ppb
| ppm | ppb |
|---|---|
| 0.001 | 1 |
| 0.01 | 10 |
| 0.1 | 100 |
| 1 | 1000 |
| 10 | 10000 |
| 100 | 100000 |
| 1000 | 1000000 |
| 10000 | 10000000 |
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