TL;DR: The Science of Survival Heat Fire is not a "thing"—it is a high-temperature exothermic chemical reaction between a fuel and an oxidant. To master firestarting in survival situations, you must move beyond primitive methods and understand the **Fire Tetrahedron**: Fuel, Heat, Oxygen, and the **Uninhibited Chain Reaction**. Success is dictated by the **Surface-Area-to-Volume ($SA:V$) ratio** of your tinder, the **Vapor Pressure** of your fuel, and the **Activation Energy*