There are 1000ug in a milligram. Therefore 3/1000 is the dilution you need. Decide on the volume, divide by 1000, multiply by 3 and that is the volume of stock that you need.
1000mcg per milligram.
There are 1000 micrograms in one milligram.
1 milligram = 1,000 micrograms 1 microgram = 0.001 milligram
There are 1000mcg (micrograms) per milligram.
0.001 a milligram is 1,000 of a gram, 1 microgram is 1,000,000th of a gram.
This question doesn't make sense. This is because the term parts per million means either weight per weight i.e. micrograms per gram or milligrams per kilograms, or weight per volume, i.e. milligrams per litre or micrograms per millilitre.
There are 1000 micrograms in a milligram. Therefore 2000 micrograms is 2 milligrams.
There are 1000 micrograms in every milligram, so you divide the amount in micrograms by 1000 to get the amount in milligrams. Think about it this way: A milligram is bigger, so there has to be more micrograms to make up for this. Also remember, that mcro, by SI convention means 0.000001, or a millionth (of a gram) and milli means 0.001. 0.001/0.000001 is 0.001. So this means a microgram is 0.001 milligrams, 0.001 milligrams to get this to 1 milligram, you have to multiply by 1000. Therefore you have 1 milligram equals 1000 micrograms.
mcg is an abbreviation of microgram, so 1 mg = 1000 microgram = 1000 mcg.
There are 1,000 micrograms (mcg) per milligram. So, multiply milligrams by 1,000 to get micrograms.
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!
Specifically I'm looking to answer the below question; You can only weigh accurately to 1 mg on your balance, but you need to make a solution containing 128 microgram of penicillin per cm3. Suggest a way you can do this accurately.