The inflation pressure of the Oxygen Cylinder shall not exceed the specified pressure, and overfilling is strictly prohibited; the gas cylinder is inspected every 3 years and can be used only after passing the inspection. The inspection is carried out in the inflation unit. Oxygen is blue in liquid and solid state, so the oxygen bottle is painted blue, but the oxygen in the Oxygen Cylinder is in the form of high-pressure gas instead of liquid oxygen.

Medical oxygen cylinder. The unit of measurement for the size of a medical bottle is the volume unit: liter and its size is calculated in liters. A 10-liter cylinder can hold about 10 liters of water, while a 40-liter cylinder can hold 40 liters of water. A full cylinder has about 135 to 150 atmospheres of pressure. The larger the volume, the more oxygen it can hold.
The pressure in a full Oxygen Cylinder cylinder is the same regardless of the cylinder volume. That is to say, whether, in a 4-liter 10-liter bottle or 40-liter bottle, the pressure is the same when the bottle is full. If the pressure is the same, the volume determines how much oxygen the bottle can hold.
Observation method of pressure gauge. The pressure gauge is an instrument that tells us how much pressure is left in the Oxygen Cylinder. It is part of the medical oxygen inhaler. Through the pressure gauge, we can know if the bottle is full and how much oxygen is left.
There are mainly 4 liters, 10 liters, 15 liters, and 40 liters of medical oxygen cylinders circulating on the market. No matter which one you buy, the first thing to consider is whether you have a stable source of medical oxygen. Because a medical bottle is nothing but a container, we buy it to use medical oxygen.
Through the above introduction and analysis of the Characteristics of Oxygen Cylinder, hope it helps you.