Air movement in injection bottle in Air, Winds And Cyclones – Class 7 Science Experiment

Chapter Name: Air, Winds And Cyclones

Activity Name: Air movement in injection bottle in Air, Winds And Cyclones

Activity Description:

Air movement in injection bottle in Air, Winds And Cyclones - Class 7 Science Experiment

The experiment explores air movement and temperature effects on a water drop placed inside an injection bottle with a ballpoint refill inserted in its cork. By warming the bottle and then placing it in cold water, the behavior of the water drop is observed.

Required Items:

  1. Empty injection bottle
  2. Empty ballpoint refill
  3. Cork to fit the injection bottle
  4. Water

Step by Step Procedure:

  1. Remove the pin from the ballpoint refill.
  2. Insert one end of the refill into the cork of the injection bottle, creating an airtight seal.
  3. Place a small water drop on the upper end of the ballpoint refill.
  4. Rub your hands together to warm them up.
  5. Hold the injection bottle in both hands to warm it as well.
  6. Observe what happens to the water drop on the refill.

Experiment Observations:

  • When the bottle and the refill are warmed, the water drop may move or show some changes in behavior.
  • Place the warmed injection bottle in a saucer of cold water.
  • Observe what happens to the water drop on the refill when it comes in contact with the cold surface.


  1. Be cautious while handling the injection bottle and the ballpoint refill.
  2. Do not touch the water drop during the experiment to avoid interference with the results.

Lesson Learnt from Experiment:

The experiment demonstrates the impact of temperature on air movement inside the injection bottle. When the bottle is warmed, the air inside expands, leading to a change in pressure, which may affect the behavior of the water drop.

Placing the warmed bottle in cold water causes the air inside to contract, potentially leading to a different behavior of the water drop. This experiment helps students understand the relationship between temperature, air pressure, and air movement.

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