How to determine the height of a skyscraper with a barometer

The best joke in weeks. I’ve heard parts of it before, but never the whole thing. Enjoy (you might want to study Physics- if you did not do that or are not doing that already- after this :-)):

This concerns a question in a physics degree exam at the University of Copenhagen: “Describe how to determine the height of a skyscraper with a barometer.”
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