Combustion, heat transfer and smoke behavior
Combustion requires a suitable fuel, oxidizer and ignition conditions, with a sustained chemical reaction. Removing heat, separating fuel or oxidizer, or interrupting the reaction can affect combustion, but the appropriate method depends on the material and situation. Flash point concerns ignition of vapor in a specified test with an external source; it is not the same as spontaneous ignition or a universal safe handling temperature.
Heat moves by conduction, convection and radiation. Radiation can heat surfaces that are not in contact with the original flame, while hot gases can move through openings and shafts. Compartment behavior depends on fuel, ventilation, geometry and heat losses. Flashover and backdraft describe different phenomena; neither can be predicted reliably from a single color or fixed room temperature alone. An opening can alter the oxygen supply and flow path.
Use physical models within their assumptions. Absolute temperature is required in a fourth-power radiation comparison. A fire-load calculation must keep energy, reference fuel value and floor area consistent. Egress calculations compare the time available with detection, response and travel components of the required time, with uncertainties and safety margins retained. These written concepts do not authorize an untrained person to enter a fire or initiate ventilation.