No.
ppm is a ratio - a pure number - whereas a litre (not litter!) is a measure of volume, with dimensions [L3].
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Multiply ppm by 10000.
Divide ppm by 10,000:50,000 / 10,000 = 5 %
Divide by 10000. For example - something with a concentration of 120ppm is 0.0012%
ppm means parts per million; percent basically means parts per hundred. Therefore, to convert from ppm to percent you should divide by 10,000.
1 ppm = 0.0001 percent. Now go forth and convert.I'll do the first one for you: Zero ppm = Zero percent.