# PPM - 百萬分之一，到底怎麼算

### $1ppm=\frac1{10^6}$

$\frac{solute\;(mg)}{solution\;(kg)}$

Ex. Find the concentration in ppm of a solution in which 0.0059 g of NaCl has been dissolved making a solution with a mass of 750 g.

$\begin{array}{l}NaCl\;is\;solute\;=\;0.0059\;g\;=\;5.9\;mg\\Water\;is\;solvent\;=\;750\;g\;=\;0.75\;kg\\ppm\;=\;\frac{mg}{kg}=\frac{5.9\;mg}{0.75\;kg}=7.87\;ppm\end{array}$

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