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TEMPERATURE: Generally, heat is furnished from an outside source, like a match or spark, and after that the fire produces enough of its own heat to be self-supporting. If we reduce the temperature of any burning substance below it is kindling point, the fire in every fire pits will go out. Sometimes enough heat is definitely generated within substances, such as in a pile of fatty rags, to cause them to break open into flames. This is referred to as spontaneous combustion. Certain bacterias in moist hay may cause the temperature to rise swiftly, causing the hay to burn. These sources of heat cannot be ignored when considering flames prevention and safety, and deciding what to burn in your outdoor fire pit. OXYGEN: Although there are other chemicals that can combine with fuels to produce heat, breathable oxygen is the most common. The need for oxygen to sustain a fire in all fire pits is proven by the fact that fuels heated up in a vacuum will not burn off. Sorry there will be no outdoor fire pits in space!

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