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Residual air is the air left over in the lungs after you exhale. Now the purpose of residual air in the lungs is to prevent the lungs from collapsing. If no air will remain, the lungs would completely deflate and the tissue will stick together and case the lungs to collapse. In addition, the residual air keeps the lungs ventilated between breathes. 

Residual air is the amount of air that remains in the lungs following a maximal expiration. 

The residual air that remains in the lungs and are not expired. In unhealthy conditions such as asthma attack and diffuse obstructive emphysema, the residual volume is higher than normal.


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