Hot Air Balloon : Density & Air Experiment for Kids 2
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Hot Air Balloon : Density & Air Experiment for Kids

Hot Air Balloon : Density & Air Experiment for Kids 3

Hot Air Balloon is a fun science experiment for kids to do at home where one can understand the effect of temperature on the density of air. Kids have seen big hot air balloons and here they will learn exactly what makes the balloon rise and fall and how a pilot is able to maneuver it while in the air by making their own hot air balloon!

Safety First! Adult Supervision Required, Don’t Eat/Drink your Experiments, wear safety goggles where ever required


Materials and tools required.

Materials Required for the Experiment

In the box

  • Zlife Poly-bag
  • 4 Straws
  • Aluminum Foil
  • Birthday candles
  • Black tape

From Home

  • Scissors
  • Ruler
  • Lighter
  • Fevi-kwik
  • Permanent Markers

Video on Youtube for the Experiment

What to Do!

  1. Take a poly-bag
  2. Draw your design at the closed end.
  3. Make 3 slits in the straw as shown
  4. Join the cut straw with an uncut straw
  5. Mark 36 cm on the straw
  6. Cut along the mark. Make two such straws.
  7. Mark the centre of both set of straws.
  8. Join the two straws in the centre perpendicular to each other.
  9. Tape it at the intersection of two straws.
  10. Cut the square piece of aluminum foil 6cmX6cm
  11. Cut the candle into half.
  12. Place seven candles equally and fix it.
  13. Stick the candle base to the straw base.
  14. Your hot air balloon base is ready.
  15. Carefully insert the base
  16. Stick one end of the straw to one edge and opposite to the other.
  17. Light the candles.
  18. Your hot air balloon is ready. Go outdoors and fly it!

Images for Instructions

Working Principle of Hot Air Balloon :

The science behind the flight of a hot air balloon is the same science that makes us float in a pool. It’s DENSITY!

Density is calculated by taking the mass of an object and dividing it by the volume of the object. So, if there is air inside a hot air balloon and air outside of the balloon, how can they have different densities? Here comes the role of TEMPERATURE. The warmer a substance gets, the faster its atoms or particles move!

Once we light the candles, the atoms inside the hot air balloon get heated and they move much faster than the atoms on the outside. Some of them escape from the hot air balloon. This means there are fewer atoms inside the balloon compared to the surrounding air. This means the balloon is less dense and it will start floating as we know that for something to float, it needs to have low density! This is how your hot air balloon flies!


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New Experiments. New Tools Every Month. Science Box for Kids. Click to Know More

New Experiments. New Tools Every Month. Science Box for Kids. Click to Know More

 

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