Question

What is the use of residual volume of air in lungs

Answer 1

It prevents your lungs to get burst out. It also prevents sticking of lungs wall.

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.

$\large{\bold{HOPE \:IT \:HELPS \:YOU!!!}}$