|Difficulty: Intermediate 4|
|Cost ($): 20|
Time required:1 day to prepare, 1 day for the experiment
Availability of materials:Easily found
Choir singers will have greater lung capacity than non-singers.
Lungs are part of the human respiratory system. All humans have two lungs which consist of blood capillaries, bronchioles and alveoli. Our lungs are protected by our rib cages which consist of 12 pairs of bones. The breathing process consists of inhalation, which is the process by which our lungs are filled with air, and exhalation, which is the expelling of air from our lungs.
When air is inhaled into the lungs, the following events take place:
This is why we breathe in oxygen and breathe out carbon dioxide.
The term"lung capacity" refers to the amount of air a person lung can hold. The lung capacity of an average person is about 4000 to 6000 cm3. However, only a third of this capacity is normally used. When strenuous work is being done, the body will require more oxygen and the air intake in the lungs will be increased.
Athletes, wind instrument musicians and singers are known to have higher lung capacities compared to a normal person. This does not mean their lungs are bigger. Their chest muscles are stronger allowing them to expand their chests more in order to increase the air intake and to contract the chests more to exhale more air.
The materials required for this experiment:
The results show that the choir members were able to inflate the balloons to a larger size, as compared to the non-singers. Therefore the choir students were found to have bigger lung capacities. It was also ascertained that boys have a bigger lung capacity then girls.
Use the below graph to plot the results in the above table.
The hypothesis that choir singer will have greater lung capacity than non-singers is proven to be true. Through training, the students were able to strengthen their chest muscles to inhale and exhale more air and therefore increase their lung capacity.
The capacity of our lungs indicates the condition of our health. All of the cells in our body require oxygen therefore it is very important to keep our lungs healthy. Activities like smoking, which reduce our lung capacity must be avoided
The experiment can be repeated by athletes instead of choir singers.
Try to repeat the experiment using a spirometer instead of balloons to measure lung capacity.