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parts per million = ppm
Nickel is an element. Therefore, in any nickel item it is 1 billion parts per 1 billion or 1 million parts per million.
1% is 10,000 parts per million.
I is ot possible. You need TWO measures to convert to parts per million.
0.0035% Parts per million can be converted to parts per hundred by dividing by 10,000 or setting up a proportion. 35 ppm = 0.0035 parts per hundred. hence percentage it is 0.0035%