Use of syringe in Air, Winds And Cyclones – Class 7 Science Experiment

Chapter Name: Air, Winds And Cyclones

Activity Name: Use of syringe in Air, Winds And Cyclones

Activity Description:

Use of syringe in Air, Winds And Cyclones - Class 7 Science Experiment

This experiment aims to demonstrate the concept of air pressure using a syringe. By drawing out the plunger of the syringe to its limit, closing the nozzle with a finger, and then attempting to press the piston, we can observe the effects of air pressure.

Required Items:

  1. Syringe (without the needle)
  2. Finger

Step by Step Procedure:

  1. Take a syringe and ensure it is free from any obstruction.
  2. Draw out the syringe plunger to its maximum extent.
  3. Close the nozzle of the syringe firmly with your finger.
  4. Attempt to press the piston back into the syringe barrel.

Experiment Observations:

  • When trying to press the piston, it might be challenging or impossible to do so.
  • While attempting to push the piston, you may feel resistance and pressure on your finger.


  1. Use a syringe without a needle to avoid accidental injuries.
  2. Handle the syringe carefully to prevent breakage.
  3. Avoid using excessive force while attempting to press the piston.

Lesson Learnt from Experiment:

This experiment illustrates the concept of air pressure. When the nozzle of the syringe is closed with a finger, the air inside the syringe is trapped, creating a region of high pressure. As a result, pressing the piston becomes difficult due to the opposing force exerted by the trapped air.

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