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.
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Multiply by 1000. So 1 milligram equals 1000 micrograms.
300ng/ml is 300 micrograms per litre which is the same as 300ppb (parts per billion), or 0.3ppm (parts per million)
There are 1,000,000 micrograms in a gram. There are 1,000,000,000 nanograms in a gram. Therefore there are 1000 nanograms in a microgram, and as such, a microgram is 1000 times larger than a nanogram.
In the UK 300 pennies = 3 pounds
3500ml equal in fat