A glass of water is covered with a piece of paper and flipped upside down. The atmospheric pressure pushing up against the paper is stronger than the weight of the water pushing down, keeping the water inside the glass.
The filename is a specific file associated with a widely circulated scientific demonstration or "trick" involving paper and friction . The "Paper and Glass" Experiment video_2021-10-05_17-36-19.mp4
This video typically demonstrates a physics principle where a piece of ordinary paper is used to "cut" or support a significant amount of weight, or more commonly, it shows a . The specific video you are likely referencing demonstrates: A glass of water is covered with a