![]() Materials that are full of air heat up quickly and reach the ambient air temperature faster than solids. Some of this difference is attributable to composition, but it also has to do with density. Experiments have found, for example, that the auto-ignition temperature for newspaper is about four degrees lower than that of the filter paper used in chemistry laboratories. This is also why it takes so long for a campfire to reduce a log to ashes.īradbury asserted that “book-paper” burns at 451 degrees, and it’s true that different kinds of paper have different auto-ignition temperatures. The dense material in the center of a book would shunt heat away from the outside edges, preventing them from reaching the auto-ignition temperature. It would take a few minutes for a sheet of paper to burst into flames upon being placed in a 480-degree oven, and much longer than that for a thick book. ![]()
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