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Do singers have a larger lung capacity than non-singers?Featured science projectScience project video


The materials required for this experiment:

  • 5 boys and 5 girls age 15 all of whom have been members of the school choir for at least a year
  • 5 boys and 5 girls age 15 and are not in the school choir, and who are not athletes
  • 60 balloons
  • 1 ruler / measuring tape
  • 1 nose plug / swimmer nose clip 


  1. For this experiment, the independent variable is the type of singer (whether or not the singer is a member of the school choir.) The dependent variable is the singer's lung capacity, which is measured by the size of the balloon blown. This is determined by measuring the size of the balloon using a ruler / measuring tape. The constants (control variables) are the age of the students, the type/brand of balloon used for the experiment and the room temperature and weather conditions.
  2. The 1st student is asked to take a deep breath and hold his breadth.
  3. Then a nose plug / clip is used to close off the student nostrils.
  4. Give the student an deflated balloon and have him blow as much air as he can into the balloon without inhaling again.
  5. Measure the diameter of the balloon using the ruler/measuring tape and record the results in the table below.
  6. Remove the nose clip / plug.
  7. Procedures 2 to 6 are repeated for the other 19 students. The procedure should be done on the same day, all at once (ie: in the morning), and in the same room, to ensure that the temperature and other room conditions are constant for each student. Have them blow into the same type of balloon. Record all measurements in the table below.


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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 1 day for the experiment
Material availability:
Easily found
Safety concerns: