Class VII measuring lung volume activity

 

Measuring lung volume (specifically vital capacity) can be done using a DIY water displacement experiment. By exhaling into a submerged, water-filled jug, the air displaces water, allowing you to measure your maximum breath volume in a container. 

Water Displacement Method (DIY)

1. Prepare the Setup: Fill a large plastic container with roughly 4 inches of water.
2. Fill the Jug: Fill a clear, large (e.g., 1-gallon) plastic jug completely with water.
3. Submerge the Jug: Place your hand over the opening of the jug and carefully turn it upside down, submerging the opening into the container's water without letting air in.
4. Insert Tube: Work a plastic tube or straw under the mouth of the jug.
5. Exhale: Take a deep breath and exhale as much air as possible through the tube, causing air to replace the water in the jug.
6. Measure: Mark the water level with a permanent marker. Re-fill the container to that line with a measuring cup to determine your total lung capacity in milliliters.

The activity was interesting and students understand lung volume measurement in a good way.