Displayed image resolution

Why do images shot at 300 ppi on a Nikon D300 display in PS CS5 at 240ppi at a larger physical size?

You should first understand that the concept of ppi is completely arbitrary.  What matters is the total pixel count (horizontal x vertical).  You do not shoot images at any particular ppi - the concept is meaningless.
But if you're converting raw files, what's causing the specific choice of a default ppi of 240 for you is the setting that you can adjust in Camera Raw, by following the link at the bottom-center of the dialog.
-Noel

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