So this is known as the title volume and we'll talk about what the title volume is and how it's measured in the next several electrodes. Now, if we take the number of breadths that are made by the rest individual every single minute and we multiply by the tidal volume, the amount of volume that is exchanged by the lungs every single breath and we multiply these two values we get 6000 ML or six liters. And this describes the total volume of air that is exchanged by the lungs every single minute. So if we wait a minute, our lungs exchange six liters of air. Now, the question is how many molecules are found within six liters of air assuming we're at room temperature and at atmospheric pressure so how many molecules does this represent at room temperature? At a temperature of about 21 degrees Celsius and a pressure of about one atmospheric pressure, one ATM.