However, in some cases, paper can catch fire without any specific external influence. This is possible in a situation of so-called self-ignition. In this case, self-ignition, that is, the occurrence of an explosion or open fire on the surface of a combustible material, occurs when the ambient temperature reaches a certain critical level.
The indicated critical temperature level depends on the density of the substance, its flammability class and some other indicators. It should be borne in mind that paper in this respect is a fairly flammable material. The average ambient temperature at which its self-ignition occurs is about 450 ° C, but it may vary slightly depending on the grade and density of the paper, as well as its humidity.
Thus, if the paper is placed in an environment whose temperature exceeds 450 ° C, or the temperature of the atmosphere is gradually brought to this value, the paper will ignite spontaneously, that is, an open fire will appear on its surface. A similar reaction will occur if the paper is placed in an environment with a higher temperature, as in the open fire example.
451 degrees Fahrenheit
In the literature, one can find mention that the autoignition temperature of paper is 451 degrees Fahrenheit, which is equivalent to approximately 233 degrees Celsius. At the same time, as an argument to prove this point of view, the title of the novel by the American writer Ray Bradbury “451 degrees Fahrenheit”, which was allegedly given to him in honor of the temperature of burning paper, is given.A simple experiment with placing paper in an oven at 250°C shows that auto-ignition of paper does not occur at this temperature. At the same time, in one of his interviews, the writer later admitted that he simply confused the designations of the temperature scales after consulting with a friend
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| June 26-28, 2007 information from the article " 451 degrees Fahrenheit” appeared on the main page in the column “ Did you know". The column contained the text: Ray Bradbury's novel "451 degrees Fahrenheit " was first published in Playboy magazine in 1953". The full edition of the column can be found in the Did You Know archive. |
| This article was proposed for renaming on October 17, 2015. As a result of the discussion, it was decided to leave the name Fahrenheit 451 (novel) without changes. To re-submit an article for renaming, you need good reasons, otherwise it can be regarded as a game with the rules (see paragraph 8). |
Strange disappearance of one line
Where did the line about the overlap of ideas between Sheckley and Bradbury go? In my opinion this link is quite logical. Dencher
451 degrees Fahrenheit
No need to disambiguate in the main article. The novel is an order of magnitude more significant than the ancient film adaptation. - doublep 12:03, September 19, 2006 (UTC)
I don't insist, you can transfer to Fahrenheit 451 (values) --Butko 12:05, September 19, 2006 (UTC) So it was. A reference to the values is quite appropriate. - doublep 12:12, 19 September 2006 (UTC)
This is ORISS, of course: I tried to look what is on the Web about Beatty's visit to Montag. Well, somehow there was nothing about where the author (with the mediation of Beatty) deduces the described society where books are burned. And there it is curious - from a society where the absence of disagreements and the comfort of ever smaller minorities are absolutized ( minor minor minorities). Can, who is closer to good libraries - try to search. Yury Tarasievich June 29, 2007 09:55 PM (UTC)
The government is at war
It would be more correct to say that the government is on the brink of war, the announcement of which sums up the work 195.24.254.68 01:44 June 15, 2011 (UTC) Il Principe
Autoignition temperature of paper
I removed the information that "Actually, the ignition temperature of paper is 451 °C (Celsius)." A single study not published in the scientific press, even if carried out by a Ph.D., can hardly be considered a sufficient source for such a strong statement.
It should be noted that the ignition temperature of paper is not a constant value at all, this temperature will depend on: the composition of the paper, the proportion of oxygen and other gases in the air, humidity, and pressure. In addition, many types of paper have additional processing (waxing, oiling, etc.), paper of the same composition and produced using the same technology, but produced now and 100 years ago, will differ significantly from each other. Therefore, you should not look for a single temperature value for all types of paper. But it is possible to determine the temperature range in which, under given external conditions, guaranteed paper ignition will occur. In addition, stacks of papers (including books) just do burn very badly, only the outer part burns, the core (due to lack of oxygen) does not burn at all, so burning paper stacks must be stirred for complete combustion. But even on burnt paper, it is possible to make out what was written (or printed) on it until the paper crumbles to dust. And even after the paper crumbles to dust, it is possible to read the text written on it (there is such a game "puzzles"), but this requires a lot of jewelry work (which is determined by the number of girls involved in the work), and when modern technologies all the work of folding paper dust into a sheet can be done by robots in conjunction with an image recognition system. Bulgakov also wrote: "Manuscripts do not burn," and he was absolutely right.
Additionally, the article in the English section en:Autoignition temperature says that the burning temperature of paper varies in different sources. The source for this statement, however, is indicated there about the autoignition temperature wood, not paper, but still - in my opinion, there are enough reasons to doubt the quoted statement. Ilya Voyager 09:56, 12 September 2011 (UTC) And what about the rumors that Bradbury, after confusing Celsius and Fahrenheit, then personally admitted this mistake? Has anyone come across a source like this? 128.69.7.107 01:12, 17 January 2013 (UTC) Gentlemen, I think there's just a misunderstanding here, related to the following two things: 1) not everyone understands the difference between ignition and self-ignition; 2) By coincidence, the autoignition temperature of paper, measured in degrees Celsius, is equal to the ignition temperature of paper from an external source, measured in degrees Fahrenheit. Let me explain. Self-ignition is, speaking plain language when the combustion process begins without a third-party source of fire. If you heat the paper to 450 degrees Celsius, then it will light up by itself. But you can light paper at a much lower temperature of about 233 degrees Celsius, i.e. 451 degrees Fahrenheit (middle of approximate range). Those. the paper begins to release the necessary combustible substances that can be set on fire literally with a spark, but they themselves will not ignite without any additional influences. Regarding the reference book, the link to which is given in the text. Without context, it is not entirely clear what is at stake. But if you read the paragraph above "Measurement", then you can see that this is an experiment to measure the self-ignition temperature, because. a simple heating of the substance is carried out, without arson. In fact, they simply heated the papers in a glass flask and looked to see if spontaneous combustion occurred. If nothing happened for two minutes, the temperature was raised by 5 degrees and a new piece of paper was placed. The lowest temperature at which the paper began to burn (only from heating!), And called the combustion temperature. Bradbury's epigraph says: "FAHRENHEIT 451: The temperature at which book paper catches fire and burns." As I understand it, it translates something like this: "451 degrees Fahrenheit: the temperature at which book paper begins to burn." It does not follow from this formulation that we are talking about the spontaneous combustion temperature. So there is probably no error. --SlavnejshevFilipp 18:26, 29 January 2014 (UTC) I have come across texts written explicitly based on information from the article. The authors fully understood what they were talking about. Georg Pik 19:03, 29 January 2014 (UTC) I'm not a physicist, but it follows from the above that the autoignition temperature is the same as the ignition temperature. In addition, quite often something is baked in the oven in paper at 240 degrees, and the paper does not light up. So the author must have made a mistake.
37.146.218.16 17:59 February 15, 2016 (UTC)
The reference books indicate different values \u200b\u200b- "ignition temperature" and "flash point". The second is usually applied to gases and liquids. The flash point of liquids is studied in a simple device consisting of a container heated by an electric stove, a thermometer, a lid with a sliding sector window, a wick and a spring-loaded trigger, pressing which opens the window and brings the wick to it. The flash point is the minimum temperature at which a liquid can be ignited by the open flame of a wick. Oleg Sazonov (obs.) 19:05, December 28, 2019 (UTC)
book people
What is the Bible prohibition? Here are the publications of the USSR year - circulation 1928 - 35.000 1956 - 25.000 1968 - 25.000 1976 - 50.000 1979 - 50.000 1983 - 75.000
Yes, and the revelations of the convict in the radio program, to put it mildly, are not quite an authoritative source
- 1. Between 1928 and 1956 - a whole Stalin era. 2. The mentioned circulations are a drop in the bucket (compare with the millions of copies of ordinary literature). 3. A lot of books were banned, and the same Bible, which was not formally banned, in principle could not be found either in the store or in the library. 4. And even more so, not only forbidden, but in general any books that were somewhat suspicious from the point of view of sedition could not be found in prison libraries (and there were none in Siberian camps). 5. Finally, a variety of books were read as a keepsake, not only forbidden ones. animal 19:51, September 1, 2012 (UTC)
- So many words and not a word of specifics, "Siberian camps", "millions of copies", "many books" .. is it a lot or a little, everything is known in comparison and in production capabilities - and look at today's circulations - this is a fairy tale now a millionth (one !million) circulation and, moreover, technology and resources allow printing large volumes. In general, biased edits in the article, at first it is written that it was interpreted as inspired by McCarthyism in the USA, in the history of creation that by burning books in the Third Reich, Bradbury himself mentioned the media, and someone (perhaps you) confidently attributed about the USSR, so where is the truth, if it was not explicitly expressed by the author, does it mean that it is necessary to indicate that these are "one of the opinions-interpretations"? // "Alexey from Siberia"
Consumers are completely in vain ignoring parameters such as ignition temperature(ignition), spontaneous combustion (self-ignition) and smoldering modern materials during the construction and renovation of buildings. Ignoring them can turn into a big disaster: accidents and loss of property. After all, most of us only carefully study the wear resistance, strength, specific heat capacity of building materials.
In this article, we will try to fill this gap and give auto-ignition temperatures - or more precisely, "the minimum temperatures required to ignite paper, gasoline, very many materials, as well as gas or vapor in air without the presence of a spark or flame" (all in degrees Celsius) according to foreign sources part in the table - the rest in the text:
The lowest self-ignition temperatures for white phosphorus are 34 and transparent -49 (but for amorphous - 260 degrees), carbon disulfide - 90, diethyl ether - 160, acetaldehyde - 175 degrees (in degrees Celsius). Next comes a group of materials for which, in order for them to ignite, higher, but not prohibitive, temperatures are needed.
Acetylene will ignite at 305, acetone and propanone at 465, bituminous coal and anthracite will glow, respectively, at 464 and 600 degrees, self-ignite - benzene at 560, gasoline self-ignites at 260-280 degrees (kerosene - below 210 ° C), butadiene - 420 , butane - 405 (or 420 degrees), bituminous coal at 300, butyl acetate - 421, butyl alcohol - 345, butyl methyl ketone - 423, hydrogen -500, heptane - 204, hexane - 223, hexadecane, cetane - 202, hydrogen - 500 , gas oil - 336, glycerin - 370, diesel fuel (foreign brand Jet A-1) ignites at 210 degrees, charcoal and coke coal, respectively - 349 and 700, dichloromethane - 600, diethylamine - 312, diisobutyl ketone - 396, diisopropyl ether - 443, dimethylsulfoxide monoxide-215, dodecane and dihexyl-203, isobutane-462, isobutene-465, isobutyl alcohol-426, isooctane-447, isopentane-420, isoprene-395, isopropyl alcohol-399, isophorone-460, isohexane-264, isononan-227, isopropyl alcohol-399, light hydrocarbons-650, lign it glows at 526 degrees, carbon-609 spontaneously ignites, coal oil-580, kerosene-295, fuel oils (depending on the brand) have self-ignition temperatures of 210-262 degrees, magnesium-473, methane-580, methanol, methyl alcohol-470 (there is a brand with t = 375), nitroglycerin will flare up at 254 degrees, nylons at 289-377, sulfur - 243, styrene - 490, propylene, propene - 458, polyethylene will ignite depending on the chlorine content at temperatures of 415-420 degrees, polystyrene - 226, polyvinyl alcohol - 405, propane - 455, industrial gas - 750, carbon - 700, carbon monoxide - 609, semi-anthracite coal - 400, cotton fabric - 267, cyclohexane - 245, ethyl cellulose - 188 degrees Celsius.
A1 jet fuel ignites at 210 degrees Celsius. Popular materials now are products made of polycarbonate, polypropylene. Polycarbonate ignites at a sufficiently high temperature - 478, but polypropylene ignites before paper at a temperature of 201 degrees Celsius.
It is often forgotten to mention the ignition temperatures of rubber and rubber products. Rubber, butadiene will ignite at a low temperature of 155, and rubber, butyl at 185 degrees. The auto-ignition temperature of low-purity natural rubber is 191, and high-purity rubber is 331, vulcanized rubber is 412, with the addition of styrene-butadiene, depending on the additives, 182 degrees (with 24% filling of the additive) and 280 degrees (with the addition of 85%).
Like most of its products, oil ignites at a rather low temperature - 225 degrees Celsius, for obvious reasons, the ignition or ignition temperatures of paper are very close to it - 218-246 degrees, peat - 227, but dry oak wood is much higher - 482 degrees and pine forest - 427, just wood - 300 degrees, semi-anthracite coal - 400. Strictly speaking, the standardized value of the ignition (ignition) temperature of paper is 233 ° C or 451 ° F ", and this must be taken into account, since paper ignition is frequent the cause of fires when left cigarette butts, not extinguished matches.
Heavy hydrocarbons ignite spontaneously at - 750, toluene - 535, cotton - 221, cyclohexane - 245, cyclohexanol - 300, cyclohexanone - 420, cyclopropane - 498, acetic acid - 427, carbon - 700, furfural - 316, epichlorohydrin - 416, ethane - 515, ethylene, ethene-450, ethyl acetate-430, ethyl alcohol, ethanol-365, ethylene oxide-570 gr. Celsius.
As a result, consumers can often unwittingly become victims of an accident: fire, poisoning by products of combustion and smoldering of materials, or, as they say, get burned out of the blue.
The following are the temperatures of ignition (ignition), spontaneous combustion (self-ignition) and smoldering of some frequently used, as well as "exotic" materials that are not included in the reference material above according to domestic sources.
Note: Auto-ignition temperatures in the table are given for a substance in a molten state.
You also need to know about the seemingly harmless scattered sugar, or rather about its dust. Any place containing sugar dust and a lot of oxygen, such as a sugar silo, can quickly become a hazardous environment. According to fire protection studies, a room covered with at least 5 percent of its surface area with the thinnest layer of sugar dust (0.8 mm) poses an explosion hazard. Tiny sugar particles burn almost instantly due to the high surface area to volume ratio. Table sugar or sucrose is highly flammable when right conditions just like wood. True, at the beginning, when sugar is heated, it turns brown and caramelizes, losing moisture in it, turning almost into charcoal, and sugar molecules line up in long chains. When the temperature rises, a flash occurs, which blinds and an explosion occurs. These properties of sugar are considered by some as a biofuel option, and not only.
In conclusion, material should be given that can be no less useful in practice: what kind, as well as about the alternative to oil and gas in terms of high.
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I had a friend who constantly confused the titles of books. For example, she called "451 degrees Fahrenheit" "451 degrees Celsius", and Orwell's "1984" in her head turned into "1982", then "1980". She was terribly angry because of this - both at herself (at her memory) and at me (I was always correcting her).
Well, I think she would be very surprised if she knew that her "bad memory for names" is not so bad...
***
Most recently, one of the readers left a comment on my post about. She noticed that paper, contrary to Ray Bradbury's claim, burns at 451 degrees Celsius, not Fahrenheit. That is: Bradbury just mixed up the scale.
Looking for prooflinks, I came across a wonderful book by Harry Dexter "Why not catch-21?: the stories behind titles" (you can buy it on Amazon)). This book is a collection of articles on the history of the names of famous books.
And the riddle of the name of Ray Bradbury's novel finds a solution there too: G. Dexter refers to the work of Jens Borch (Jens Borch) "Handbook of Physical Testing of Paper". Specifically -- to this paragraph: "The ignition temperature of paper is about 450 degrees C, but it is somewhat dependent upon the paper quality. The ignition temperature is 450 degrees C for rayon fibers, 475 degrees C for cotton, and 550 degrees C for flame-resistant cotton".
It turns out that Bradbury really made a mistake (which, of course, does not make his novel less significant and remarkable; and Bradbury himself less talented; it just seems to me that this is very interesting fact). On the other hand, the text referred to by G. Dexter refers to paper containing cotton and linen fibers (which, as Google tells me, is used to produce money, for example). Obviously, the pages of books are much thinner than banknotes, so the combustion temperature should be lower. Therefore, everything is not so obvious here. This is a question for physicists, I think ...
***
Now about Orwell:
Orwell finished his famous novel on December 4, 1948, so it is believed that the author simply swapped the last two digits to move the action into the future. In fact, in the drafts, the novel was called first "1980", then "1982", then " Last Man in Europe". But, according to Harry Dexter, the figure 1984 is a reference to another dystopia - to the "Iron Heel" (Iron Heel) by Jack London.
In general, the book "Why not catch-21?: the stories behind titles" is a very interesting reading, and certainly a must-read for any bookworm. Under the cover are collected more than 180 articles about the origin of the names of the most significant works in the history of literature: from antiquity to the present day - Plato, Shakespeare, Rabelais, More, Pushkin, Dostoevsky, Heller, O "Henry, Baum and many, many others.
For example, did you know that Joseph Heller's novel Catch-22 was originally called Catch-18 in the manuscript? The problem is that in 1961, just before the publication of "The Catch", Leon Uris's book "Sweetheart 18" appeared on the market, and the publishers decided that two books with the number "18" in the title were somehow too much, they say readers will confuse them. That's why Heller changed his name. So it goes.
"Manuscripts don't burn!" - wrote the famous Russian prose writer and playwright M. Bulgakov. In fact, the legendary quote has nothing to do with real facts. Fire easily turns fibrous material into ash, and the ignition temperature of paper depends on its type, air humidity, oxygen level in the atmosphere and the power of the heat source.
The essence of the process
From the point of view of science, combustion is a chemical oxidation reaction, as a result of which heat, carbon monoxide, hydrogen and other gaseous substances are released. We observe combustion products in the form of smoke with a sharp, specific smell. Usually paper ignites in the presence of an oxidizing agent and an ignition source, but self-ignition is also possible. Oxygen acts as an oxidizing agent, it must be at least 14% in air.
Dry paper sheets or rolls can be set on fire from an open flame, a spark of electrical or mechanical origin, an incandescent object. The absorption of paper by fire begins with an exothermic reaction, if nothing is done in time, then the process initiated by ignition does not die out and soon turns into stable combustion.
Characteristics
As you know, for the industrial production of paper, wood, cotton fibers, flax, hay or recycled materials (waste paper) are used. At the primary stage of processing, boiled wood pulp, which is destined to become a material for writing, drawing and other human needs, contains up to 95% of water. After drying, the paper becomes dense, smooth and sensitive to fire.
Different printing methods impose their own requirements on sheets in terms of density, texture, color, so the ignition temperature of paper differs slightly depending on its type. For a photograph to light up, the Celsius degrees must exceed 365°C. To obtain a glossy material, resin is added to the composition, which helps to accelerate the thermochemical reaction.
If the hostess in the kitchen is dealing with fatty milled cellulose material, which does not have to be pre-oiled, then the ignition temperature of baking paper will be 170 ° C. But, as a rule, the coefficient of heat resistance of "professional" baking films with silicone impregnation is much higher (up to 250-300 °C). Special refractory paper almost does not support combustion, has good mechanical strength, heat-resistant fiber can withstand temperatures above 1,000 °C.
Flash point of paper in Celsius
In Russia and a number of other countries, including European ones, degrees Celsius are used to measure temperature, which are also used in international system units (SI) along with kelvin. Anders Celsius defined 0 °C as the melting point of ice, and at 100 °C water boils. As for the ignition temperature of paper, remember the famous epigraph to Ray Bradbury's novel?
"451 degrees Fahrenheit is the temperature at which paper ignites and burns."
Already after the publication of the book "451 degrees Fahrenheit" it turned out that a mistake was made in the title: fire on the surface of paper pages occurs at a temperature of 451 degrees Celsius, and not on the Fahrenheit scale. Later, the author of the bestseller admitted that, after consulting with a familiar fireman, he simply confused the temperature equivalents.
Flash point of paper Fahrenheit
Residents of England and the United States are more accustomed to using the Fahrenheit scale, which is named after the physicist Gabriel Fahrenheit, where zero degrees Celsius is 32 ° F. For a long time, the scale of the German scientist was used in all English-speaking countries, but at the end of the 70s of the last century, it was almost completely replaced by the Celsius scale. The freezing point of water in Fahrenheit became + 32 °, and the boiling point + 212 °. By simple calculations, it can be determined that the process of burning paper or cardboard starts if the dry material is heated to 843 degrees Fahrenheit.
Combustion or Ignition: What's the Difference?
Ignition is considered the beginning of burning paper under the influence of an ignition source. In fact, this is the starting mechanism, after which the chain reaction. If you have time to respond in time, you can eliminate the fire without outside help.
Ignition is always accompanied by a sustained flame, releasing the light and heat needed to sustain the fire. The greatest danger is loosened paper: it is sufficiently saturated with oxygen to be ignited by a spark or the heat of local heating. A few degrees can be added or subtracted from the average ignition temperature of paper, depending on the quality of the fiber and the burning conditions.
High temperature measurement method
Flame temperature measurement has its own specific features and difficulties. To determine the ignition temperature of paper or any other combustible material, you need a pyrometer. It is also called an infrared thermometer or a thermodetector. There are optical, radiation and spectral pyrometers. An electronic device is indispensable in cases where you can’t get close to the fire.
A pyrometer is a precision engineering device that is designed to measure the power of thermal radiation in a non-contact way. The device serves as an excellent alternative to contact means, they can remotely calculate the temperature of hot objects or use them as heat detectors in various industrial areas. You can determine at what temperature the paper ignites using a low-temperature pyrometer.
Is self-ignition possible?
A sharp self-acceleration of exothermic reactions without external influence of a flame or a hot body leads to self-ignition. The auto-ignition temperature of paper is around 450 °C. When determining the indicator, the degree of moisture content of the material, its composition, the presence or absence of pigment dyes are taken into account. Simply put, a "bonfire" from waste paper is able to ignite on its own when the ambient temperature reaches a critical level.
A decrease in air humidity and an increase in the concentration of oxygen in the combustion center affect the auto-ignition temperature, reducing it. Oiled sheets of paper after drying are prone to thermal spontaneous combustion, but tapes in rolls are reluctant to burn. If heat and smoke are released, but there is no flame, the process is called smoldering.
By the way, illusionists often use self-igniting paper in their performances. For example, a sheet impregnated with sodium peroxide ignites quickly and brightly when in contact with a small amount of water. The spectacle is very spectacular, but quite dangerous, therefore, without certain technical skills, it is not recommended to perform a "trick" at home.
Don't play with fire!
Paper poses a serious fire hazard, it quickly ignites, actively interacts with vapors and gaseous products contained in the air, and burns intensively. In residential apartments and houses, a gas stove, an overheated or faulty electrical appliance, an unextinguished match, a cigarette can become a source of ignition. The main cause of household fires is human negligence, non-compliance with elementary safety rules.
Do not leave paper near heaters, do not overload the electrical network. Do not put cardboard sheets under the TV, computer, lighted candles. To prevent paper from becoming a source of fire, never smoke in bed, keep a fire extinguisher and thick cloth in the house - with their help, the flame will not have time to spread to neighboring objects. Overalls, as well as 100% cotton denim, are poorly flammable.
Even if the paper catches fire, act judiciously and do not panic. If possible, eliminate drafts - access to fresh air adds strength to the fire, cover your face from acrid smoke with a damp handkerchief, turn off all electrical appliances from the sockets and, having grabbed important documents, leave the room. Knowing and strictly observing the rules of safe behavior, you can prevent the spread of fire without risk to life.
Summing up
Introduce everyday life humanity without books, magazines, notebooks, calendars and other printed matter is almost impossible. The paper that was so highly valued in ancient world, played an exceptional role in the development of literature and painting, education. Its irrational use threatens not only with the destruction of millions of trees, but will inevitably lead to a humanitarian catastrophe in the future. Take care of paper, be vigilant and careful with fire - this is how we will preserve the beauty of our planet, make the world a better place!
