Like, they don’t have an opening right? How are they sealed?
EDIT: I should rephrase: there has to be some sort of machine that pressurizes, and, in the pressurized environment, seals the opening while not letting out air. How does that look like?
In: Engineering
[This page has a cutaway](https://officechairpicks.com/gas-cylinder/), as you can see the tube isn’t solid there are openings at the top and bottom. The bottom is filled with compressed air from that opening, then the opening is sealed.
The top opening is controlled by the height lever, that hissing sound is air going into/out of the top part which controls how far the compressed gas in the bottom part can push upwards.
Latest Answers