reference
https://www.youtube.com/watch?v=5wn916moUy8
TLC Total Lung Capacity = Amt of air when lungs are maximallly filled
RV residual volume = amount of air left in the lungs after maximal expiration
FEV1 – Forced expiration after 1 second of expiration is the amount of air that comes out in 1st second of expiration
FVC Forced Vital Capacity – Is the total volume of air of air that can exhaled after after a maximal inspiration