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Here's an article on atmospheric pressure and how it functions:
http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/fw/prs/def.rxml
And here's an article on the molecular mass of air, including its components:
http://www.engineeringtoolbox.com/molecular-mass-air-d_679.html
Be sure to take out any spaces in the links. What it comes down to is: no. We are not anatomically structured for things like flying. Beside the point of this thread, which was asking about spells to do the impossible. Spells cannot do everything, no matter the amount of belief and willpower. Simply put.
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