Why are all cylinders considered dangerous?

Cylinders are considered dangerous primarily because they are pressurized. Pressurized cylinders contain gases or liquids at a pressure significantly greater than atmospheric pressure, which poses risks if the cylinder is damaged or improperly handled. When a pressurized cylinder fails, it can lead to explosive decompression, resulting in high-velocity projectiles and the potential for serious injury to people nearby. Additionally, the release of contents from a damaged cylinder can create hazardous environments, especially if it involves flammable or toxic gases.

While other factors like the material the cylinder is made from (such as steel or aluminum) and its contents can also present dangers, the pressurization factor is a critical element that heightens the risk associated with these cylinders. Hence, the inherent danger lies in the pressure they contain, which can have severe consequences if not managed properly.