Tidal volume is the amount of air that is inhaled or exhaled during a normal breath. It is a key measurement in respiratory physiology, helping to assess lung function and overall health. Typically, the tidal volume for an average adult at rest is about 500 milliliters. This measurement can vary based on factors such as age, sex, body size, and physical fitness. In medical settings, monitoring tidal volume is important for patients on mechanical ventilation, as it ensures they receive adequate air supply for proper oxygenation and carbon dioxide removal.