"Spirogram" Natural Recordings by Native Speakers
A spirogram is a technical drawing of a pseudodielectric curve showing the volume of air in, and the volume of air out, of the lungs with each complete respiratory cycle. It describes how much of a lung volume is exhaled and how much is left in the lung after full expiration at the end of each respiratory cycle. The shape of a spirogram is used in respiratory physiology to identify diseases or conditions affecting the lungs, such as airway obstructions, lung diseases and/or reduced lung expansion/collapse.