How does breathing gas consumption vary with depth?

Breathing gas consumption increases as depth increases primarily due to the increase in ambient pressure experienced underwater. As a diver descends, the pressure surrounding them rises, which also affects the gas being inhaled. According to Boyle’s Law, the volume of gas decreases under increased pressure, but the diver's metabolic requirements remain constant. As a result, divers typically breathe more gas at greater depths to meet their body's oxygen needs.

At greater depths, the denser air being inhaled can lead to a higher overall gas consumption rate. This increase is influenced not only by pressure but also by the diver's level of exertion and activity underwater, which may vary with depth as well. Therefore, more effort and energy expended at greater depths contribute to the overall increase in breathing gas consumption. This principle is essential for divers to understand for proper gas management and safety during dives.