Conas an uimhir faoin gcéad (%) a thiontú go codanna in aghaidh an mhilliúin (ppm) .
1% = 1/100
1ppm = 1/1000000
Mar sin, tá aon faoin gcéad cothrom le 10000 cuid-in aghaidh an mhilliúin:
1% = 10000ppm
Mar sin
x (ppm) = 10000 ⋅ x (%)
Tiontaigh 1.7% go ppm:
x (ppm) = 10000 ⋅ 1.7% = 17000ppm
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