Chapter Name: Respiration In Organisms
Activity Name: How much air in your breath? in Respiration In Organisms
In this activity, you will measure the amount of air exhaled in a single breath. This will help you understand the volume of air exchanged during respiration.
- Two-liter plastic bottle
- 100 ml injection bottle
- Measuring cylinder
- Rubber tube
- Bucket or large container of water
Step by Step Procedure:
- Create a measuring cylinder by marking water levels in the two-liter plastic bottle. Pour 100 ml of water at a time into the bottle, and mark the water level after each addition.
- Fill the plastic bottle to the brim and invert it in a bucket or a large container of water, ensuring no air bubbles remain inside the bottle after inversion.
- Insert one end of the rubber tube into the mouth of the bottle under the water and hold the other end in your hand.
- Inhale deeply and then blow the air out into the measuring cylinder through the rubber tube. Do not inhale while blowing the air out.
- Blow out as much air as you can in a single breath, and the air will collect in the measuring cylinder.
- Measure the reduction in water level in the cylinder, which is equal to the volume of air you exhaled in that breath.
- Note the reduction in water level in the measuring cylinder after exhaling the air.
- Ensure no air bubbles are trapped inside the plastic bottle before starting the experiment.
- Use a rubber tube that fits tightly in the bottle’s mouth to prevent air leakage.
- Perform the experiment in a controlled environment to avoid disturbances.
Lesson Learnt from Experiment:
This experiment demonstrates the volume of air exhaled in a single breath, which is a crucial aspect of the respiratory process in organisms. It helps understand the amount of air exchanged during respiration and highlights individual variations in breathing capacity.
Science Experiment Kits for Kids