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).
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Oh, dude, it's like converting microgram per gram to parts per million (ppm) is a piece of cake. All you gotta do is multiply micrograms per gram by 1000 to get parts per million because there are 1000 micrograms in a milligram. Easy peasy, lemon squeezy!
There can be no equivalence. A milligram (mg) is a measure of mass while parts per million (ppm) is a ratio of the mass of one substance relative to the mass of a mixture of that and other substances. It is a pure number and according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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%.
ppm means mg per litre. mg/l means 100ug/dl. Therefore there are 10 x 10 micrograms per decilitre in ppm. In other words, 10ug/dl is 0.1 ppm.
1 ppm is approximately 1gram per ton