Measuring lung volu Focus In this exercise, you complete a results table. Then you calculate mean values and draw a bar chart. Sofia and Zara want to know if learners who play wind instruments in the school orchestra can push more air out of their lungs than learners who play stringed instruments. The girls take a large, empty bottle. They mark a scale on the side to show volumes. 1 Describe how Sofia and Zara can make the scale on the bottle. ​