Approximately 625 liters corresponds to which cylinder?

• A. E cylinder
• B. D cylinder
• C. M cylinder
• D. G cylinder

Answer: (A)

Understanding how much oxygen is inside a cylinder helps you predict how long you can provide it at a given flow. The 625-liter figure is the typical full-volume capacity of the E-size cylinder. In other words, when this size is filled to its standard pressure, it contains about 625 liters of oxygen. Other sizes carry different amounts: a smaller D-size is around 350 liters, a larger M-size about 3,000 liters, and a very large G-size around 5,000 liters or more. Because run time depends on how many liters per minute you’re delivering, you can estimate duration by dividing the cylinder’s volume by the flow rate. For example, at 2 L/min, an E-size cylinder would roughly last 625 ÷ 2 ≈ 312 minutes (a bit over 5 hours); at 15 L/min, it would be about 625 ÷ 15 ≈ 42 minutes. This is why 625 liters corresponds to the E-size cylinder.