The fire triangle explains the three elements that must be present for a fire to ignite, and understanding the fire triangle helps us understand, prevent and respond to fire. All three elements are required for a fire.
Heat
Heat is the first element, and heat may originate from a range of sources, such as an open flame or an electrical source. Once the fire has ignited, heat continues to be produced, the fire intensifies and spreads, and it may ignite flammable and combustible materials.
Fuel
A fire must have fuel in order to sustain itself and continue to burn. Any material that burns when it is exposed to both heat and oxygen can act as fuel for the fire. Fuels can be natural, such as wood or leaves, or synthetic, such as plastic or gasoline. Different fuels have varying burn temperatures and rates, meaning fires can produce different flames and smoke. Experts advise that in the event of a fire when there is smoke present, keep low where the air is clearer.
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Oxygen
The last element is oxygen, which acts as an oxidiser and is necessary for fires to exist. It oxidises and breaks down fuel molecules, which releases energy and also heat, making the fire burn faster and brighter.