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HIGH TEMPERATURE: Generally, heat is offered from an outside source, say for example a match or spark, and next the fire produces enough of its own heat to be self-supporting. If we reduce the temperature of the burning substance below it is kindling point, the fire in all fire pits will go away. Sometimes enough heat is generated within substances, including in a pile of slimy rags, to cause them to burst into flames. This is referred to as spontaneous combustion. Certain bacterias in moist hay can cause the temperature to rise swiftly, causing the hay to burn. These sources of temperature cannot be ignored when considering open fire prevention and safety, in addition to deciding what to burn in your outdoor fire pit. OXYGEN: Although there are other chemicals that can complement fuels to produce heat, air is the most common. The need for o2 to sustain a fire in most fire pits is shown by the fact that fuels warmed up in a vacuum will not melt away. Sorry there will be no outdoor fire pits in space!

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