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Understanding Breathing Gas Needs

Your breathing rate depends on your level of exercise and depth. The higher your level of exercise, the more oxygen you need and the more CO2 you will produce. In order to flush the CO2 from your lungs while diving, you must inhale breathing gas. The chart below shows the relationship between depth, pressure, exercise and breathing gas requirements. The deeper the depth and the higher the level of exercise, the greater the demand for breathing gas.

Breathing Gas Needs: How Much Air is Required to Ventilate Lungs?

Depth (Feet)

Environmental Pressure
(Atmospheres)

Breathing gas Needs (Liters per minute)

At rest

Light to moderate activity

Vigorous exercise

0 feet (Surface)

1 ATM

8 lpm

20 lpm

70 lpm

30 feet

2 ATM

16 lpm

40 lpm

140 lpm

100 feet

4 ATM

32 lpm

80 lpm

280 lpm

By the Numbers

The Aluminum 80 is the most commonly used tank.

Specifications:

  • Internal tank volume: 11 liters (0.39 cubic feet).
  • Maximum pressure allowed: 3,000 psi (207 bar)
  • 80 cubic feet = 2,265 liters (1 cubic foot = 28.317 liters)

How Long Will My Breathing Gas Last in an Aluminum 80?

Depth (Feet)

Environmental Pressure
(Atmospheres)

Breathing gas Needs (Liters per minute)

At rest

Light to moderate activity

Vigorous exercise

0 feet (Surface)

1 ATM

215 minutes

70 minutes

20 minutes

30 feet

2 ATM

107 minutes

35 minutes

10 minutes

100 feet

4 ATM

53 minutes

17 minutes

5 minutes


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