Final answer:
The amount of air in a normal inhalation or exhalation is called the tidal volume, which measures the amount of air inspired and expired during a normal breath.
Step-by-step explanation:
The amount of air in a normal inhalation or exhalation in a resting status is the tidal volume. Tidal volume measures the amount of air that is inspired and expired during a normal breath. On average, the tidal volume is around one-half liter.