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• Fuel — can be any combustible material — solid, <br /> liquid or gas. Solids and liquids must be heated <br /> to a vapor or gas before they will burn . <br /> • Oxygen — the air we breath is about 21 % <br /> oxygen . Fire only needs an atmosphere of 16% <br /> oxygen to burn . <br /> • Heat — heat is the energy necessary to increase <br /> the temperature to the fuel to a point where <br /> sufficient vapors are given off for ignition to <br /> occu r. <br /> Take any one of the three factors away, and the <br /> fire cannot occur or will be extinguished if it was <br /> already burning . <br />