I often use
\pgfphysicalwidth from the
pgfpages package to define sizes dynamically based on the dimensions of my page (which vary). For example, here's a "dynamic" vertical space:
What units are these pgf values actually in? In other words, what is the value of
\pgfphysicalheight if my document height is 10in?
I found nothing in the
pgfpages docs. Also tried logging the values with
\show, but got something cryptic like "\dimen195" which I couldn't decipher further.