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Angelys Cruz García
Prof. Ricardo ColónLaboratory - 7th grade

Introduction :

Lung volumes lung capacity refer to the volume of air associatedwith different phases of the respiratory cycle. Lung volumes are directly measured. Lung capacities are inferred from lung volumes.

Strategy :

You will measure the amount of air in your lungs.
Youwill determine your average lung capacity.

Material :

balloon (round )
metric ruler

Procedure :
1. Stretch a balloon several times. Then take a deep breath and blow into the balloon.Exhale as much air as possible.

2. When you take the balloon away from your mouth, hold the open end tightly so that no air escapes. Resume normal breathing.

3. Measure the air-filled balloon'sdiameter by placing it next to a ruler as shown in Figure 1. Record the diameter of the balloon in Table 1 in Data and Observations.

4. Repeat steps 1-3 four more times. Record the results inData and Observations.

5. The diameter of your balloon does not give you your lung capacity. To change the diameter of the balloon to liters (the metric unit for volume), you must use a graph. Locateyour balloon diameter for Trial 1 along the bottom axis of the graph in Figure 2. Read up to the curved dark line, then across to locate your lung capacity. Record your long capacity for alltrials.

6. Total your results by adding each column of numbers in Table 1. Find the average by dividing each total by the number of trials.

Data and Observations

Table 1

Questions1. What is meant by the term lung capacity?

- The lung capacity is the amount of air your lungs can hold.

2. Why was it necessary to change the balloon diameter to liters when finding...
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