## Does the Volume of the Lungs Change During Scuba Diving?
When you scuba dive, you are breathing compressed air from a tank. This air is at a higher pressure than the air at the surface, so your lungs must expand to accommodate the extra volume.
The amount that your lungs expand depends on the depth of the dive. The deeper you go, the greater the pressure, and the more your lungs must expand.
At a depth of 33 feet (10 meters), the pressure is twice that of the surface. This means that your lungs must expand to twice their normal volume.
At a depth of 66 feet (20 meters), the pressure is three times that of the surface. This means that your lungs must expand to three times their normal volume.
And so on.
## How Do Lungs Expand During Scuba Diving?
Your lungs expand during scuba diving due to a combination of two factors:
1. The increased pressure of the air in your tank. This pressure pushes against the walls of your lungs, causing them to expand.
2. The relaxation of your diaphragm. Your diaphragm is a muscle that separates your chest cavity from your abdominal cavity. When you inhale, your diaphragm contracts, pulling your lungs down and increasing their volume. When you exhale, your diaphragm relaxes, allowing your lungs to recoil to their normal volume.
During scuba diving, the increased pressure of the air in your tank helps to keep your diaphragm relaxed. This allows your lungs to expand more easily and to accommodate the extra volume of air.
## What Happens if Your Lungs Do Not Expand Properly?
If your lungs do not expand properly during scuba diving, you can experience a condition called pulmonary barotrauma. This condition occurs when the pressure inside your lungs exceeds the pressure outside your lungs. This can cause damage to your lungs and can be fatal.
Symptoms of pulmonary barotrauma include:
Chest pain
Shortness of breath
Coughing up blood
Difficulty breathing
If you experience any of these symptoms, you should stop diving immediately and seek medical attention.
## How to Prevent Pulmonary Barotrauma
You can prevent pulmonary barotrauma by:
Equalizing your ears. Equalizing your ears helps to keep the pressure inside your ears equal to the pressure outside your ears. This prevents your ears from feeling blocked or painful, and it also helps to prevent pulmonary barotrauma.
Ascending slowly. When you ascend from a dive, you should ascend slowly to give your lungs time to adjust to the decreasing pressure. Ascending too quickly can cause pulmonary barotrauma.
Not diving if you have a cold or congestion. If you have a cold or congestion, your sinuses and ears may be blocked. This can make it difficult to equalize your ears and can increase your risk of pulmonary barotrauma.
## Conclusion
The volume of your lungs changes during scuba diving due to the increased pressure of the air in your tank and the relaxation of your diaphragm. It is important to equalize your ears, ascend slowly, and not dive if you have a cold or congestion to prevent pulmonary barotrauma.