I've read a bit about fire on wiki and I have some questions. 1. There is an exact ignition temperature for each material. Temperature reflects the amount of energy, heat. But also specific heat capacity of a each substance is different. So is the amount of heat, which is necessary for of ignition, the same for different substances? If different, why is that so? Can we calculate this amount of heat with formula? 2. If we have a certain amount of fuel we can calculate the amount of heat, which will be produced during combustion. This heat will be produced not immediately, but gradually. So there is a "speed" with which heat is produced. Can we calculate it? 3. If there is the speed of heat production, there might be also the speed of heat absorption. Can we calculate it))? Thank you very much in advance!!