What is the operating principle of a continuous-flow oxygen system?

The operating principle of a continuous-flow oxygen system involves having high-pressure oxygen that flows through a pressure regulator before it reaches the mask outlets. This system is designed to provide a constant supply of oxygen to the user. Unlike other systems where oxygen is dispensed in bursts or manually controlled, the continuous-flow system ensures that oxygen is delivered consistently and at the appropriate pressure, which is crucial for maintaining adequate oxygenation, especially at high altitudes.

The pressure regulator is vital as it reduces the high pressure of the oxygen stored in tanks to a usable pressure for the mask. This ensures a steady and reliable flow of oxygen, allowing the user to breathe it continuously without interruption, especially during scenarios like climbing to altitude or in situations where supplemental oxygen is essential for safety.

The other options describe different mechanisms or characteristics not inherent to the continuous-flow system. For example, some systems do operate in bursts or have different release mechanisms, but that does not apply to the continuous-flow design.