Here you go, Piston area and force.

He'll just ignore all this, he's built his whole argument on p = f/a which be fine if were talking hydraulics
not combustions of gasses in a sealed chamber that the volume expands over time.

Obviously this paragraph from his grade six text book is all that's needed to explain thermodynamics of an engine. Were just not able to grasp the intricacies of coin being smushed into playdough is obviously the problem :)

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Yup, hard to teach astrophysics to a flea.