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1 ppm is one part per million, or one millionth - percentage (which is latin for per hundred) wise, 1 ppm is .0001%
no, cm3 is a specific volume. parts per million is equivalent to percent but for much smaller values. for example 50 ppm means 50 out of every million parts. it doesn't matter if it's a drop or truck load
1% is 10,000 parts per million.
4.5 million miles ----------------------------------------------------- get the cost per mile and multiply this by 4.5 million.
1 part per million, used to describe how many of one type of particle you will find amongst another type of particle