1 gallon = 128 fluid ounces
1 oz / 1 gal = 1/128 = 0.0078125 = 7,812.5 x 10-6 = 7,812.5 per million
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No, one percent is one part per 100. 1 ppm is equal to one part per 1,000,000. In other words, 1 PPM is 10,000 times smaller than 1%.
1 ppm is approximately 1gram per ton
1 gallon = 16 cups 1 cup =0.23 gallon
Given that a liter of water does weight about a kilogram, there would be a million milligrams of water per liter, so yes, one milligram per liter does work out to be one part per million (ppm).
1 fluid oz = 29.5735296 ml