okay so here we're going to talk about lung volumes and we're going to make it really simple so first let's just fill in these values in this chart over here okay so here we have our values let's start with total lung capacities that's easy imagine breathing in as much as you can so all that air that's in your lungs that's the maximum air that could be in your lungs that's the total lung capacity then we come out to vital capacity so vital capacity let's say you breathe in as much as you can and then you breathe out as much as you can all that air that you're able to breathe out is the vital capacity but there's still going to be some air that you can't get out that's the air inside of your lungs that's the residual volume that's left over and that is the amount that cannot be measured through spirometry okay then we come up to inspiratory capacity so imagine you're breathing normally you're breathing normally and then after you exhale normally then you breathe in as much as you can that's the inspiratory capacity because that's the amount that you can inspire the most you can inspire after a normal expiration okay then we come to expiratory reserve volume this is when you're breathing normally and after you expire how much more can you further expire that's the expiratory reserve volume and then what's left again is the residual volume then we come up to inspiratory reserve volume imagine you're breathing normally and after you inspire you inspire even more meaning after you inspire normally you inspire more you force more inspiration that's the inspiratory reserve volume then we got to this volume is the most discussed uh measurement and is the title volume is how much you normally breathe that's the title volume and then we come up to the functional reserve capacity and that's that after a normal expiration how much is left in your lungs after a normal expiration so these values are extremely important for diagnosis in pulmonary pathology and we'll discuss these a lot what's fantastic about this chart is you could see the the relationships let's say total lung capacity so total lung capacity is going to be fc plus rv or total lung capacity is going to be ic plus erv plus rv or total lung capacity is going to be irv plus tv plus erv plus rv it's fantastic you don't need to like do any math you can just look at this chart and see it so there's a great chart to have and i hope it's helpful