If a cylinder of air lasts 20 minutes at 20 meters, how long will it last at 10 meters?

To determine how long a cylinder of air will last at a different depth, we need to consider the effects of pressure on air consumption. At 20 meters, the pressure is significantly higher than at 10 meters.

When diving, the air consumption is proportional to the ambient pressure; at 20 meters, the pressure is approximately 3 atmospheres (2 atmospheres of water plus 1 atmosphere of air). At 10 meters, the pressure is around 2 atmospheres (1 atmosphere of air plus 1 atmosphere of water).

If a diver consumes a cylinder of air in 20 minutes at 20 meters, we can calculate the equivalent time at 10 meters. Since the pressure at 10 meters is lower, the air consumption rate will decrease because there’s less pressure. Therefore, the volume of air the diver will use in a given time frame will also decrease.

To calculate this, we can use the concept of “breath per minute” or the relative consumption at different depths. The ratio of pressures can inform us how much longer the air will last.

At 20 meters, the cylinder lasts 20 minutes at a pressure of 3 atmospheres. At 10 meters, the pressure decreases to 2 atmos