So we essentially inhale and then we exhale and we exchange about 500 air every time we take that breath. Now, what exactly is the maximum amount of air that the lungs can actually store? This is called the total lung capacity and it's the distance between this maximum point and the zero line. And on average, for an average individual, it is equal to about 6000 ML or six liters of air. So if the person wishes, they can take a very deep breath. So if I take a very deep breath, let's say I start at this point, I go all the way up to this point and at the maximum point on this curve, this is this black line right here, and the distance from the black line all the way to zero.