An oxygen cylinder should be taken out of service and refilled when the pressure inside it is less than 500 psi.
What is gas pressure?
Gas pressure is pressure exerted by gas molecules on the walls of their container.
Since gas molecules move faster with increase in pressure, it is important to maintain oxygen gas cylinders at fairly high pressures.
Therefore, an oxygen cylinder should be taken out of service and refilled when the pressure inside it is less than 500 psi.
Learn more about oxygen gas at: https://brainly.com/question/22208188
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