Oxygen Cylinder
In short
A high-pressure metal container used to store oxygen gas for medical or industrial use.
In plain words
It is a strong, sealed bottle that holds oxygen under a lot of pressure. People use it when they need extra air to breathe or for special scientific work.
A simple example
A patient at home might use a small portable cylinder to get oxygen while walking around the house.
Why it matters
These cylinders are vital for life support in hospitals and for divers underwater. They allow oxygen to be moved safely from a factory to where it is needed.
Easy to mix up
Do not confuse it with a regular air tank, which holds normal air rather than pure oxygen.