So this is a pretty standard "Whoosh Bottle" experiment, but with a twist, in that he covers his hand (palm) on the bottle after the flame dies out. I understand why the bottle is squished, but what I don't understand is how the bottle got "sucked", or stuck, to his hand. What is the physics behind this suction?
From what I understand, and I could be wrong, suction is the consequence of pressure differential, whereby fluid flows (pushes) from a region with higher pressure into the region with lower pressure. How do I use this to explain the suction effect that is observed when he covers the bottle with his palm?
Surely, treating his palm as a fluid with higher pressure that is trying to flow into the bottle, hence causing the suction effect, is a little farfetched, if not outright incorrect. Is it possible that it is the atmospheric pressure that is pushing the palm inwards, hence causing the suction?
I apologize if my question sounds stupid. Please feel free to explain in as much detail as you see fit. Mathematical equations of any level, if required, would be welcome.
Thank you for your answers.