At the Flat Earth International Conference (FEIC) 2019 in Dallas, Texas, flat earther Nathan Thompson cornered heliocentric creationist Danny Faulkner. Since Nathan believes in an enclosed universe, he asked Danny “How can you have air pressure without a container?”
I have heard Mark Sargent say that his favourite flat earth proof is that the difference between air pressure and a vacuum disproves gravity. I had honestly not understood what he meant by that until Nathan Thomason’s graphic question brought it into focus. At Flatoberfest 2023, I asked Mark Sargent to expand upon that while Danny Faulkner was listening just a few feet away: