Functional residual capacity
Volume of air in the lungs at the end of passive expiration / From Wikipedia, the free encyclopedia
Functional residual capacity (FRC) is the volume of air present in the lungs at the end of passive expiration.[1] At FRC, the opposing elastic recoil forces of the lungs and chest wall are in equilibrium and there is no exertion by the diaphragm or other respiratory muscles.[1]