What is the meaning of the title Fahrenheit 451?

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 The title Fahrenheit 451 is intended to refer to the autoignition temperature of paper, or 451 degrees Fahrenheit. While paper will certainly burn at this temperature, there is no fixed number for paper; depending on thickness and material, paper will ignite anywhere from 450 to 800 degrees Fahrenheit. Because of the novel's popularity, this temperature is ingrained in common thought as true. In the novel, 451 is used as the symbolic number on fireman helmets, showing their commitment to the cause of burning books and destroying knowledge. The number is used only three times in the book, each time referring to either fireman equipment, like kerosene, or to the job itself, as when Montag points to his embroidered badge.

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