How spontaneous combustion can be harmful? Explain with an example.
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Answers
Spontaneous combustion
Spontaneous combustion is the phenomenon in which a hydrocarbon (or a chemical substance) substance unexpectedly bursts into flame without apparent cause. In ordinary combustion, the hydrocarbon is deliberately heated to its ignition point to make it burn. During this process, many hydrocarbons undergo slow oxidation that, like the rapid oxidation of burning, releases heat. If the heat so released cannot escape, the temperature of the hydrocarbon rises until ignition takes place. Spontaneous combustion often occurs in piles of hydrocarbon-soaked (oily) rags and can constitute a serious fire hazard.
Answer:
Spontaneous combustion is the phenomenon in which a hydrocarbon (or a chemical substance) substance unexpectedly bursts into flame without apparent cause. In ordinary combustion, the hydrocarbon is deliberately heated to its ignition point to make it burn. During this process, many hydrocarbons undergo slow oxidation that, like the rapid oxidation of burning, releases heat. If the heat so released cannot escape, the temperature of the hydrocarbon rises until ignition takes place. Spontaneous combustion often occurs in piles of hydrocarbon-soaked (oily) rags and can constitute a serious fire hazard.
Fires started by spontaneous combustion are caused by the following mechanisms: (1) spontaneous heating, (2) pyrophoricity, and (3) hypergolic reactions.
Spontaneous heating is the slow oxidation of an element or compound which causes the bulk temperature of the element or compound to rise without the addition of an external heat source. Spontaneous heating may be the result of direct oxidation of hydrocarbons (for example, oils and solvents) or it may occur because of the action of microorganisms in organic materials