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First, you need to know the density of the isopropyl alcohol, which is about 0.785 g/cm^3. Next, you need to know how many cm^3 are in a gallon. 1 gallon = 231 in^3 = 231 * (2.54)^3 cm^3 = 3785 cm^3 Also, we need to convert from grams to milligrams 1 gram = 1000 milligrams so... (.785 g/cm^3) * (1000 milligrams/gram) * (3785 cm^3/gallon) * (1 gallon) = 2,970,000 mg
Milligrams, a unit of mass, and gallons, a unit of volume, are not actually directly equivalent, however it is common to use the volume and mass of water to "equate" the two. Using that method, where 1 (U.S.) Gallon of water weighs 128 ounces, and 1 ounce weighs 28.35 grams (approx.) or 28,350 mg 1 Gallon "equals" 128 * 28,350 mg, or 3,628,739 mg
There are ten milligrams in one centigram.
There are 1000 milligrams (mg) in 1 gram (gm).
There are 1000 milligrams in a gram.