Spirometer

soda lime in spirometer absorbs carbon dioxide

breathing rate = number of completed breaths in one minute

tidal volume = the volume of air passing into and out of the lungs during a resting breath (from trough to peak)

inspiratory reserve volume = the maximum amount of air inhaled

expiratory reserve volume = the maximum amount of air exhaled

vital capacity = the maximum amount of air exhaled after inhaling as much as possible

the volume of carbon dioxide produced is the same as the volume of oxygen used → the total volume of air decreases over time which is why the slope goes downwards