Dolly and Nora test their lung capacity (volume) prior to starting the day at the laboratory. They calibrate the spriometer to verify that it reads 3 liters of air when a calibrated syringe delivers that amount, and then take turns demonstrating that their lung capacities are remarkably close to that of the syringe.

Dolly and Nora test their lung capacity (volume) prior to starting the day at the laboratory. They calibrate the spriometer to verify that it reads 3 liters of air when a calibrated syringe delivers that amount, and then take turns demonstrating that their lung capacities are remarkably close to that of the syringe.