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Types of Oxygen

Compressed Oxygen Cylinders, or "Green Tanks"
Compressed Oxygen Cylinders, or "Green Tanks"

The gas oxygen inside the tank is delivered at 100% concentration. Sometimes oxygen tanks contain liquid oxygen, which allows for a smaller, lighter tank. Smaller, portable tanks can be filled with the oxygen from the larger tanks for use outside of the home. Liquid oxygen is also delivered at a concentration of 100%.

Liquid Oxygen Systems
Liquid Oxygen Systems

A liquid oxygen system provides the oxygen user with high concentration oxygen and does not require any electricity. A liquid oxygen reservoir is a larger tank, usually weighing over 55 kg (120 lbs.) and standing over 0.75 m (30 in) in height.

Oxygen Concentrators
Oxygen Concentrators

Oxygen concentrators are powered by plugging in to an electrical outlet or by battery. If the concentrator is powered by an electric battery, that battery will need to be charged by plugging into an outlet.

source: inogen.com