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:
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:
- Syringe (without the needle)
- Finger
Step by Step Procedure:
- Take a syringe and ensure it is free from any obstruction.
- Draw out the syringe plunger to its maximum extent.
- Close the nozzle of the syringe firmly with your finger.
- 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.
Precautions:
- Use a syringe without a needle to avoid accidental injuries.
- Handle the syringe carefully to prevent breakage.
- 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.
