Oxygen cylinders are typically used for medical or industrial purposes to store and transport compressed oxygen gas. The process of storing oxygen in cylinders involves compressing the gas to a high pressure, which allows for a larger volume of oxygen to be contained within a relatively small cylinder.

Here is a general overview of how oxygen is stored in oxygen cylinders:

1. Compression: Oxygen gas is produced and purified through various processes, such as fractional distillation or pressure swing adsorption. The purified oxygen is then compressed using specialized equipment, typically to pressures ranging from 2,000 to 3,000 pounds per square inch (psi). The high pressure allows for a greater amount of oxygen to be stored within the cylinder.
2. Cylinder Construction: Oxygen cylinders are typically made of high-strength steel or aluminum alloy. These materials are chosen for their ability to withstand the high pressure of the compressed gas. The cylinders are designed to be airtight and have valves that allow for controlled release of the oxygen.
3. Valve and Pressure Regulator: The cylinder is equipped with a valve that controls the flow of oxygen from the cylinder. The valve is usually operated manually or with the help of a pressure regulator. The pressure regulator ensures that the oxygen is released at a safe and controlled rate, which can be adjusted based on the user’s needs.
4. Safety Measures: Oxygen cylinders are subject to strict safety regulations to ensure the proper handling and storage of the gas. Various safety features are incorporated into the cylinders, including pressure relief devices, protective caps, and labeling to indicate the contents and handling precautions.

It’s important to note that oxygen cylinders should be handled with care, as oxygen supports combustion and can be hazardous in certain situations. Proper training and precautions should be followed when handling, transporting, or using oxygen cylinders to ensure safety.