Tryk
det er ikke tryk det er overfladespænding ...
se også https://www.youtube.com/shorts/MJm3aKyNEHQ
eksperiment hullet flaske spiller ikke: https://www.scienceweek.net.au/diy-science-water-bottle-pinhole-prank/#:~:text=There%20are%20cohesive%20forces%20between%20the%20water,the%20bottle%20pushing%20in%20on%20the%20water.
som trylletriks med gennemsigtig plastik med lille hul i sodavandsflaske
https://www.youtube.com/shorts/uLMQvtSGmkg (dobbelt plastikglas)
ubåd i flaske som flyder under tryk
https://youtu.be/KNS7tggekmk?t=104
https://www.youtube.com/watch?v=9n362snGUdw