What is true regarding normal quiet expiration of air?

Normal quiet expirarion of air is known as Tidal volume which is equal to 500 mL.

Explanation:

Normal quiet expiration or Tidal volume is a expiration of air with each normal breath. This is about 500 mL. It is composed of about 350 mL of alveolar volume and about 150 mL of dead space volume. The alveolar volume consist of the air that reaches the respiratory surface of alveoli and involve in gaseous exchange. The dead space volume consist of air that does not reach the respiratory surfaces. The lowest value is of Tidal volume. There is an extra amount of air that can be expired forcibly after a normal expiration i. e., known as expiratory reserve volume which is equal 1000 mL of air.