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Study how fire use up air when burning

Suitable For

Grade 8



Time Required

 <12 Hours



What’s it about?

A fire cannot burn without air or ‘oxygen’. A fire that is not burning well can often be helped along by blowing or fanning it, so that more air reaches the fire. Air or ‘oxygen’ is also used up when a fire or flame is burning. Only a part of the air is used for burning, as you will see in the following science experiment:

Topics covered

Air, Oxygen

What will I need?

  • BOWL

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

When the candle is burned, it only used part of the air in the jar. The only part of the air that was used for burning is a gas called ‘oxygen’, which makes up about 1/5th of the air. When the flame went out, it means that the ‘oxygen’ gas was used up, and the water was pushed up into the jar, as the volume of air decreased inside the jar. This happens because the air pressure outside of the jar is greater than the air pressure inside.

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