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Fire Triangle

In this worksheet, students will look at the fire triangle and what is required for combustion and also the safety aspects in terms of what is required to fight fires.

'Fire Triangle' worksheet

Key stage:  KS 3

Curriculum topic:   Chemistry: Chemical Reactions

Curriculum subtopic:   Types of Chemical Reactions

Difficulty level:  

Worksheet Overview

For combustion to take place, three things must be present:

 

1. Fuel - the substance that burns, e.g. wood, oil.

2. Oxygen - when a fuel is burned it is reacting with the oxygen in the air.

3. Heat - this ignites the fuel and keeps the fire burning.

 

This can be represented in a diagram known as the Fire Triangle:

Fire triangle

 

The three essential ingredients for a fire are shown in the fire triangle. If any one of these ingredients is removed the fire will go out.

 

Fire fighters will try to remove one side of the triangle to extinguish a fire. There are several ways to extinguish a fire.  Here are some:

 

 Fire buckets Fire blanket Fire extinguisher Fire hose

 

Sand - When sand is added to a fire it removes the oxygen.

Fire Blankets - Fire blankets can be wrapped around burning objects or people. The blanket stops oxygen getting to the flame.

Carbon dioxide (CO2) - Carbon dioxide fire extinguishers are sprayed onto the fire to remove the oxygen.

Water - Water can be added to fires to remove the heat. Water must never be used on an electrical fire or any burning oil. Adding water to burning oil will cause the cause the fire to become fiercer. Shown below is a picture of what happens when water is added to burning oil in a chip pan (not good!):

 

Burning chip pan

 

If you ever experience a chip pan fire in your home place a damp towel over the pan, call 999 and leave the house.

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