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Are You Fit?

Are You Fit? | Science Fair Projects | STEM Projects
Do you have the lungs of an athlete? Test your lung capacity with the water displacement method to find out! This method is simple: take a deep breath, blow into a tube connected to a container filled with water, and measure the volume of water that is pushed out.


The hypothesis is that if someone has a higher volume of water displacement, then his lung capacity is greater than someone with less volume displacement.

Method & Materials

You will create a fitness survey, clean the plastic tubing, fill a plastic bottle with water, have the volunteer hold the bottle in the water, have the volunteer take in a big breath and blow out as much air as possible through the tube, measure the volume of water displaced, and give the volunteer a 2-minute break between trials.
You will need 7-10 volunteers with varying fitness levels, a fitness survey, a 2-liter plastic bottle or 1-gallon plastic jug, a plastic dish pan, masking tape, a permanent marker, clear, bendable plastic tubing, a large liquid measuring cup labeled with ounces, white vinegar, water, a small cup, and paper towels.


The results of the experiment showed that those who exercised more regularly and more intensely had greater lung capacity. This indicates that regular and intense exercise results in larger lung capacity, which is one measurement of someone being fit.

Why do this project?

This science project is interesting and unique because it allows people to measure their own lung capacity and see how it relates to their fitness level.

Also Consider

Variations of this experiment could include testing the lung capacity of different age groups or testing the lung capacity of people who exercise differently.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related videos

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