Do the gases have a definite shape and a fixed volume ? in Matter Around Us – Class 9 Science Experiment

Chapter Name: Matter Around Us

Activity Name: Do the gases have a definite shape and a fixed volume ? in Matter Around Us

Activity Description:

Do the gases have a definite shape and a fixed volume ? in Matter Around Us - Class 9 Science Experiment

This activity involves observing the properties of Compressed Natural Gas (CNG) to determine if gases have a definite shape and fixed volume.

Required Items:

  1. Access to a petrol pump, CNG-run vehicle, and observation skills.

Step by Step Procedure:

  1. Visit a petrol pump and inquire about the storage location of CNG.
  2. Observe the storage system of CNG in a CNG-run vehicle.
  3. Note the process of transferring CNG from the pump to vehicles.

Experiment Observations:

  1. CNG is stored in high-pressure cylinders at the petrol pump.
  2. CNG-run vehicles have special tanks to store the compressed gas.
  3. CNG is transferred from the pump to vehicles through appropriate mechanisms.


  1. Follow all safety guidelines and regulations at the petrol pump.
  2. Stay at a safe distance from any hazardous equipment or procedures.

Lesson Learnt from Experiment:

Based on the observations from the activity and our daily life experiences, it can be concluded that CNG and all other gases do not have a fixed shape or volume. They take the shape of their container and can expand or contract to fill the available space accordingly.

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