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No. ppm is a ratio - a pure number - whereas a litre (not litter!) is a measure of volume, with dimensions [L3].
It is 200:1.
To find 200 to the ratio of 2 and 3, we first need to add the two parts of the ratio (2 + 3 = 5). Then, we divide 200 by the sum of the ratio parts (200 ÷ 5 = 40). Therefore, 200 to the ratio of 2 and 3 is 40.
200:10 = 20:1
.5% = .5/100 = 1/200 so the ratio would be 1:200