Lung volume refers to the amount of air that the lungs can hold at different stages of the breathing cycle. It is typically measured in milliliters (mL) and includes various components, such as tidal volume, which is the amount of air inhaled or exhaled during normal breathing, and vital capacity, the maximum amount of air a person can exhale after a deep breath. Understanding lung volume is important for assessing respiratory health. Conditions like asthma or chronic obstructive pulmonary disease (COPD) can affect lung volumes, leading to difficulties in breathing. Medical professionals often use lung volume measurements to diagnose and monitor these conditions.