Which of the following is the most important disadvantage of a liquid oxygen system?

Question

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A disadvantage to using this system is that the base unit requires regular refilling by the DME provider. Frequency depends on both the oxygen flow rate and the size of the reservoir and can be as often as once a week to every other month. Another disadvantage to the liquid oxygen system is that it vents continually to prevent pressure from building within the reservoir, resulting in a loss of oxygen regardless of whether the flow is on or off.

Which of the Following Is the Most Important Disadvantage of a Liquid