Which three elements must be present in the right conditions for fire to occur?

The correct elements for fire to occur are heat, oxygen, and fuel. This trio is commonly referred to as the "fire triangle."

Heat is required to raise the material to its ignition temperature. Without adequate heat, the molecules of the fuel do not reach a state where they can combust. Oxygen is crucial as it supports the chemical reactions that enable combustion to occur. Most fires require a sufficient amount of oxygen from the surrounding environment. Finally, fuel is necessary because it is the material that burns, serving as a source of energy.

When all three components—heat, oxygen, and fuel—are present in the right conditions, a fire can ignite and sustain itself. If any one of these elements is missing, fire cannot occur, demonstrating the fundamental nature of the fire triangle in understanding combustion.