Interesting vacuum chamber

Handicraft construction of a vacuum bell, various experiments. The description of the video is Mr. TheAmmoniacal, Youtube Many thanks With the bottles, the vacuum pump is removing the air inside, creating a pressure difference inside the bottle and the surrounding. When the pressure difference is stronger than the plastic, the surrounding air pressure collapses the bottles. The surrounding air has a pressure equal to 1 atm, or 14. 7 pounds per square inch, which is pushing against everything. When the