In terms of oxygen vent rates for a diver at rest, what is the rate?

For a diver at rest, the oxygen vent rate is crucial because it reflects the amount of oxygen being expelled, which is a significant factor for maintaining proper breathing gas mixtures. A commonly accepted figure for a resting diver is 12.5 ACFM (actual cubic feet per minute). This rate takes into account the physiological needs of a diver positioned at rest, as metabolic rates decrease and their oxygen consumption is lower compared to activity during diving.

Understanding this value is important for dive planning and ensuring that life support systems can adequately provide or recycle oxygen, especially in environments with limited resources or closed-circuit systems. The other rates provided, while they may pertain to different activity levels or conditions, do not align with the standard requirements for a resting diver, which is why 12.5 ACFM is the correct answer in this context.