What is the formula used to determine Consumption Rate?

The formula for determining the consumption rate in diving is primarily influenced by the effects of pressure on gas consumption during a dive. As a diver descends, the pressure increases, which impacts the volume of gas inhaled. The correct formula, C = [(Depth + 33) / 33] * Breathing Constant, is based on the principles of gas laws and the increase in gas density with increased depth.

In the context of this formula, the depth is measured in feet or meters, and the constant of 33 is particularly significant because it approximates the atmospheric pressure at sea level (14.7 psi) added to the pressure experienced underwater due to the water column. The addition of 33 allows divers to account for how breathing rates increase due to both the atmospheric pressure and the increased density of the breathing gas as they descend.

Using this formula, divers can better predict how much gas they will consume at various depths, which is crucial for planning dives and ensuring they carry sufficient gas supplies to complete their underwater activities safely. The inclusion of the breathing constant tailors the calculation to individual diver physiology and breathing patterns, making the consumption rate more accurate and personalized.