The paper is made of wood or other similar raw materials therefore represents combustible material which is capable even to independent ignition. It can occur in case ambient temperature reached critical level.
Ignition temperature
Paper, as well as other combustible materials, is subject to ignition at achievement of a certain temperature. At the same time ignition of paper happens in several main cases. The first of them - influence of external factors, in other words - paper firing. In this situation meaning present of naked flame to standard sheet, the leaf is affected by high temperature owing to what there is an ignition. At the same time temperature of naked flame depending on what material is used for burning, can be from 800 to 1300 wasps: obviously, this temperature is enough for paper ignition.
However in certain cases paper can light up also without a certain external influence. It is possible in a situation of so-called spontaneous ignition. At the same time spontaneous ignition, that is emergence of explosion or naked flame on the surface of combustible material, arises in case ambient temperature reaches a certain critical level.
The specified critical level of temperature depends on density of substance, a class of its combustibility and some other indicators. It is worth meaning that paper in this regard represents rather easily flammable material. Average ambient temperature at which there is its spontaneous ignition is about 450 wasps, however can change a little depending on a grade and density of paper and also its humidity. Thus, if to place paper in the environment which temperature exceeds 450 wasps, or to gradually bring atmosphere temperature to this size, paper will self-ignite, that is on its surface there will be a naked flame. Similar reaction will happen in case of the room of paper on Wednesday to more high temperature, as in an example with naked flame.
Fahrenheit 451
In literature it is possible to meet a mention that temperature of spontaneous ignition of paper is Fahrenheit 451 that is equivalent to about 233 degrees Celsius. At the same time "Fahrenheit 451" which was allegedly given it in honor of paper burning temperature is provided as an argument for the proof of this point of view the name of the novel of the American writer Ray Bradbury. The simple experiment with the room of paper in an oven at a temperature of 250 wasps shows that spontaneous ignition of paper at this temperature does not happen. At the same time the writer admitted later one of the interviews that he just mixed designations of temperature scales after consultation with the familiar fireman.