# All Science Fair Projects

## Gender differences and lung capacity

### Procedure

Establish your hypothesis: For example - “Boys will have a (higher/lower) lung volume than girls.”

Groups

Divide the participants into two groups: 10 males and 10 females. The individuals of these groups should be of approximately the same age and have no history of asthma, bronchitis, or other health problems.

Lung Volume

Tidal Volume (TV)

1. To obtain the participant’s tidal volume, have the individual breath normally into a balloon.
2. Have the participant pinch off the end of the balloon to prevent air from escaping.
3. Wrap the string around the balloon once in order to obtain the balloon’s circumference.
4. Remove the string from around the balloon and lay the string out straight along the ruler to get the measurements of the string.
5. Write down the measurement on a separate sheet of paper.
6. Check the measurement against the “Lung Volume Conversion Table” to obtain the corresponding lung volume.
7. Record the lung volume on the separate sheet of paper.
8. Repeat these steps with the participant two more times.
9. Find the average lung volume of each participant by adding the three lung volume amounts and dividing by three.
10. Record the average tidal volume on the “Lung Volume” data sheet.
11. Repeat these procedures with all participants.

Expiratory Reserve Volume (ERV)

1. To obtain the participant’s expiratory reserve volume, have the participant practice breathing in deeply and exhaling fully.
2. When the participant is ready, have them take a normal breath in the balloon (you will not count this breath in the experiment) followed by taking a deep breath, then forcefully exhaling into the balloon.
3. Have the participant pinch off the end of the balloon to prevent air from escaping.
4. Wrap the string around the balloon one time in order to obtain the balloon’s circumference.
5. Remove the string from around the balloon and lay the string out straight along the ruler to get the measurements of the string.
6. Write down the measurement on a separate sheet of paper.
7. Check the measurement against the “Lung Volume Conversion Table” to get corresponding lung volume.
8. Record the lung volume on a separate sheet of paper.
9. Repeat these steps with the participant two more times.
10. Find the average lung volume of each participant by adding the three lung volume amounts and dividing by three.
11. Record the average tidal volume on the “Lung Volume” data sheet.
12. Repeat these procedures with all participants.
13. Determine if the results support your hypothesis.

 Lung Volume Conversion Table Balloon Diameter centimeters Lung Volume Cubic centimeters 12 1,000 13 1,250 14 1,500 15 2,000 16 2,250 17 2,500 18 3,000 19 3,500 20 4,000 21 4,500 22 5,500 23 6,000 24 7,000

 Lung Volume Data Sheet Male TV ERV Female TV ERV Participant 1 Participant 1 Participant 2 Participant 2 Participant 3 Participant 3 Participant 4 Participant 4 Participant 5 Participant 5 Participant 6 Participant 6 Participant 7 Participant 7 Participant 8 Participant 8 Participant 9 Participant 9 Participant 10 Participant 10

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Complexity level:
4
Project cost (\$):
10
Time required:
Material availability:
Safety concerns: