Oxygen cylinders are portable containers that store oxygen gas under high pressure. They are commonly used in medical settings to provide supplemental oxygen to patients with respiratory issues, as well as in industrial applications where oxygen is needed for various processes. The cylinders are made of strong materials to withstand the pressure and are equipped with valves for safe dispensing. These cylinders come in different sizes and capacities, making them suitable for various uses, from home healthcare to emergency services. Proper handling and storage are essential to ensure safety, as oxygen is highly flammable and can support combustion when in contact with other materials.