Page 244 - Primary Five Science

1. 3 burning candles are covered with glasses whose tops have

been removed

2. The first candle rests on 2 wooden blocks to allow more air

to enter. It remains burning

3. The second candle has only the top as its source of air. It

burns for a while and then goes off.

4. The third is completely cut off from any air source. It goes

off immediately.
.
Conclusion: Air (Oxygen is required for burning to continue

Zones of a burning candle

1. Blue zone

2. Yellow zone
3. Pale blue zone

4. Central zone of unburnt zone

Putting out fire

 Using fire extinguisher

 Using sand/soil or dust

 Using water

 Throw a heavy blanket to cover the fire

If the fire is caused by petrol or alcohol and other spirits, wa-

ter would not be a good choice to put out fire

This is because petrol is less dense than water therefore it

simply floats on water and fire continues burning.