one of the most important application of the avogadro's law is the inhalation and exhalation of air. Lungs expand as they fill with air exhaling decrease the volume of the lungs.Now that the world is greatly experiencing the spread of the virus it is safe for us to use face mask and face shield though breathing is sometimes a problem. Since air is very important in life let us help prevent air pollution by not smoking by regulating smoke emission in motor vehicle and factories and by planting trees and vegetables so that there will sufficient supply of oxygen gas in the air.​