Moisture in our breath in Respiration In Organisms – Class 7 Science Experiment

Chapter Name: Respiration In Organisms

Activity Name: Moisture in our breath in Respiration In Organisms

Activity Description:

This experiment aims to investigate the presence of moisture in our exhaled breath. Participants will compare the moisture content of their breath to that of air blown from a syringe onto a mirror.

Required Items:

  1. Mirror
  2. Cloth
  3. Syringe

Step by Step Procedure:

  1. Take a mirror and wipe it clean with a cloth to ensure there is no moisture or residue on its surface.
  2. Position yourself in a location where you can see the mirror clearly.
  3. Blow air from your mouth onto the surface of the mirror.
  4. Observe the surface of the mirror carefully and take note of any visible effects.

Optional Steps for Comparison: 5. Clean the mirror again with the cloth to remove any residue from the previous breath.

  1. Use a syringe to blow air onto the mirror’s surface.
  2. Observe the mirror’s surface and compare the result to the previous observation.

Experiment Observations:

  • When you blow air from your mouth onto the mirror, you will notice a misty or foggy appearance on the mirror’s surface.
  • If you repeat the process with a syringe blowing air, you may not observe the same misty effect.


  1. Ensure the mirror is clean and free from any moisture or residue before starting the experiment.
  2. Be cautious while using the syringe and avoid blowing forcefully to prevent potential hazards.

Lesson Learnt from Experiment:

Based on this experiment, it would be correct to say that exhaled air is more moist than air from a syringe. The misty effect observed when breathing onto the mirror indicates the presence of moisture in our breath. In contrast, air blown from a syringe, which does not involve respiration, may not exhibit the same level of moisture.

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