tceylan
Contributor
From PADI's encyclopedia of recreational diving, a diver's lung volume decreases
by 15-20 percent (more when vertical) due to water pressure on thorax.
I do understand why lung volume would be reduced when a diver is vertical since regulator second stage will provide x ATM (ambient pressure) whereas the lungs would be at a higher ambient pressure say: x+y ATM.
But when horizontal, why should the lung volume be less than the lung volume on surface? Second stage provides gas at the ambient pressure and our lungs would be at
the same depth as the second stage when horizontal...
by 15-20 percent (more when vertical) due to water pressure on thorax.
I do understand why lung volume would be reduced when a diver is vertical since regulator second stage will provide x ATM (ambient pressure) whereas the lungs would be at a higher ambient pressure say: x+y ATM.
But when horizontal, why should the lung volume be less than the lung volume on surface? Second stage provides gas at the ambient pressure and our lungs would be at
the same depth as the second stage when horizontal...