The Fire Triangle

In the picture

1. 1Fuel: wood, fabric and paper are things that can burn
2. 2Heat: an overloaded socket or a lit match gets hot enough to start a fire
3. 3Oxygen: the air around us feeds the flames
4. 4Candle under a glass: once the oxygen inside is used up, the flame dies

Examples

• Firefighters spray water on a fire to cool it and take away the heat.
• Putting a lid on a burning frying pan cuts off the oxygen and puts out the flames.

Quiz: The Fire Triangle (Age 12)

1. 1

   Which three things must a fire have at the same time to keep burning?

   • Heat, light and smoke
   • Fuel, heat and oxygen
   • Wood, smoke and air
2. 2

   A lit candle is covered with a glass and the flame soon goes out. Why?

   • The wax runs out
   • The oxygen inside the glass gets used up
   • The glass cools the flame down
3. 3

   To put out a fire, how many of its three ingredients do you need to take away?

   • Just one of them
   • Two of them
   • All three of them

The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.