How do you convert parts per billion to parts per million?

An example would be trace gases found in the atmosphere, such as sulfur dioxide and carbon monoxide.

-- take the number of parts per thousand -- multiply it by 1,000 -- the answer is the number of parts per million

1 ppm = 1x10-6 parts per parts 1 ppb = 1x10-9 parts per parts 1 ppt = 1x10-12 parts per parts 1 ppm = 1x103 ppb = 1x106 ppt

One milligram per kilogram IS one part per million: There are 1,000 milligrams in one gram and 1,000 grams in one kilogram. 1,000 mg = 1 g 1,000 g = 1 Kg 1,000 x 1,000 = 1,000,000

There are several ways to go about this. If you want to determine ppm of a solute in water for example, you can determine the number of grams of water in 1 L by its density (1.0 g/mL=1000.0 g/L)....