What is the surface air consumption rate if a diver uses 1080 psi from an 80 cuft cylinder to dive to 116ft for 12 minutes?

To determine the surface air consumption rate, you first need to understand how to calculate the amount of air used during the dive and how that translates to a rate per minute at the surface.

The diver used 1080 psi from an 80 cubic feet cylinder. At a depth of 116 feet, the pressure is significantly higher than at the surface due to water pressure. The absolute pressure at that depth is calculated as follows:

1. Add the atmospheric pressure (approximately 14.7 psi at sea level) to the water pressure (which is 116 feet of seawater contributing about 5.03 psi per foot, resulting in roughly 580 psi). This gives:

• Total absolute pressure at depth = 580 psi + 14.7 psi ≈ 594.7 psi.

2. The amount of air consumed is 1080 psi, and you can calculate the equivalent volume at the surface using the relationship of pressure and volume. The formula is:

[

\text{Surface volume} = \text{used air (psi)} \times \frac{\text{cylinder volume}}{\text{absolute pressure at depth}}

]

Using the values:

[

\text{Surface volume}