Question

Why residual volume of air is left in the lungs when we exhale

Answer 1

residual volume is left in the lungs even if we exhale so as to prevent the lungs from squeezing .if the residual volume is also exhaled then there will be a vaccum in the lungs and we could even die due to choking.
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Answer 2

$\huge\mathfrak\red{Heya\:Mate}$

$\huge{\boxed{\bold{ANSWER}}}$

During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbondioxide to be released.

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