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I do not understand what the meaning is of the unit

mg-$\ce{Pt}$/cm$^2$

which I have come across in reading about the theory of fuel cells.

In simple terms, what does this unit mean?

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    $\begingroup$ Milligrams of platinum per square centimeter. $\endgroup$
    – Todd Minehardt
    Sep 29, 2016 at 16:10
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    $\begingroup$ This isn't really homework, is it close voters? It's just a misguided asker. $\endgroup$
    – M.A.R.
    Sep 29, 2016 at 17:16

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The unit in question means milligrams of platinum per square centimeter.

In your application - fuel cells, and specifically the membranes used to fabricate them - it describes how much of the metal is present per square centimeter of membrane.

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