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# Chemistry understanding help. watch

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1. I was doing some exercises, i have a question here.

If the answer for a certain ppm question is, say, 3000. But if i were to write if at 0.003 ppm, is it acceptable?

Does the term ppm indicates 10^6 or it's only a unit?

I'm confused now Because some practices that i did, when the answer is 2.16 X 10^6, they just write it as 2.16 ppm.
2. ppm means parts per million. 2 ppm means '2 particles in every million'.

If you get an answer of 10^6 you can write it using SI prefixes- 10^6 is mega or M. So 2x10^6g is 2Mg. http://en.wikipedia.org/wiki/SI_prefix

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Updated: May 21, 2010
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