Lung Capacity Measurent

To compare the lung capacity of students in LS2 we used one breath to blow up a balloon, then we measured the circumference of the balloon in cm. Then we could graph the results to compare them. The person with the largest oxygen output was Julian because he made his balloon grow to 68 centimetres, and the person with the smallest output was Avalon who only managed to get hers to 48 centimetres.