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#### bergausstein

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- Jul 30, 2013

- 191

in parts per billion, by volume (ppbv). So, a concentration of carbon dioxide equal to 13 ppbv means that, for every billion volume units (say,milliliters) of the atmosphere, there are 13 units of carbon dioxide.

Convert an atmospheric concentration of carbon

dioxide of 13 ppbv to a percent (that is, what per-cent of this atmosphere would be carbon dioxide?)

my solution

$\frac{13}{10^9}=1.3\times 10^{-8}$

is this correct. if not please help me arrive at the correct answer. thanks!