The volume of air a healthy man normally inspires or expires is

The volume of air a healthy man normally inspires or expires is 500 mL per breath (tidal volume). On an average, a healthy human breathes 12-16 times per minute. So, volume of air a healthy man normally inspires or expires is (500 mL x 12-16) per minute = 6,000 to 8,000 mL per minute = 6 to 8 litres per minute.