Balloon and bubble science for the elementary kids

Last weekend star kids club classes were on balloon and bubbles.

I started the lesson by explaining the properties of air

  • We can not see air but feel
  • When we blow the air into the balloon, it occupies space, hence it has volume
  • And it exerts pressure ( blow up a balloon and open up the mouth opposing on the arm of the kid, so that he can feel the air pressure)

Then I told them that We are going to discuss about the science behind rocket, hot air balloon, helicopter and hover craft with balloon experiments. The kids were super excited and following are the pictures of our lessons. I took lots of ideas from the site Happy Brown House . Thanks for assembling all the balloon fun in one place.

We started with the rocket science. I explained the Newton’s third law of motion to the kids. For every action there is an equal and opposite reaction. I asked the kids jump up high and low and explained them for the action of their pushing force on the ground they get the equal and opposite reaction the ground pushing them up. Similarly the rockets pushing force on the ground with lots of explosion gives it a opposite reaction from the ground and lets it fly up with equal and opposite force. And we did a rocket balloon experiment showing action and reaction.

Then we did hot air balloon experiment. I explained them how the air molecules move apart on heating and becomes less dense and rise up. I showed them the balloon fixed on the bottle’s mouth blowing up when kept in hot water. I also explained them why helium balloons fly high than the balloons blown by us. Thus propane gas  inside the hot air balloon is constantly heated to keep them afloat. And the kids did hot air balloon craft with balloons and newspapers.



Then we did hover craft experiment explaining the scientific principle behind this air cushion vehicle.



Courtesy: explainthatstuff

Then we did some fun balloon boats and balloon fountains



Balloon boat

We also did penny in the balloon explaining centripetal force and hexanut in the balloon explaining that friction and vibration produce sound.

The next day was bubble science fun. I explained them the questions

  • What makes a bubble?
  • Why is a bubble round?
  • Why do bubbles pop?
  • Do bubbles have colour?
  • How to make a bubble that doesn’t pop when you poke it with scissors?

Courtesy: kidsdiscover


We ended the lesson with the song ” I am forever blowing bubbles “.

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