Lung volume refers to the amount of air that the lungs can hold at different stages of breathing. It is typically measured in milliliters (mL) and includes various components, such as tidal volume, which is the 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 volume, making it crucial for healthcare professionals to measure and monitor these values to ensure proper lung function and overall well-being.