» 
Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Thai Turkish Vietnamese
Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Thai Turkish Vietnamese

definitions - Spontaneous_combustion

spontaneous combustion (n.)

1.ignition of a substance (as oily rags) resulting from an internal oxidation process

Spontaneous Combustion (n.)

1.(MeSH)A circumstance where a substance or organism takes fire and burns without an exogenous source. Spontaneous human combustion differs from preternatural human combustibility in that in the latter, some spark or trivial flame sets the fire and the body tissues, which have a greatly enhanced inflammability, continue to undergo incineration without any external heat source or combustible materials. (Bergman NA. Spontaneous human combustion: its role in literature and science. Pharos 1988;Fall;51(4):18-21)

   Advertizing ▼

definition (more)

definition of Wikipedia

synonyms - Spontaneous_combustion

Spontaneous Combustion (n.) (MeSH)

Preternatural Human Combustibility  (MeSH)

spontaneous combustion (n.)

self-ignition

   Advertizing ▼

analogical dictionary



Wikipedia

Spontaneous combustion

                   
  A large compost pile can spontaneously combust if not properly managed

Spontaneous combustion is a type of combustion which occurs by self heating (increase in temperature due to exothermic internal reactions), followed by thermal runaway (self heating which rapidly accelerates to high temperatures) and finally, ignition.[1]

Contents

  Cause and ignition

  1. A substance with a relatively low ignition temperature (hay, straw, peat, etc.) begins to release heat. This may occur in several ways, usually oxidation by a little moisture and air, bacterial fermentation generates heat.
  2. The heat is unable to escape (hay, straw, peat, etc. are good thermal insulators), and the temperature of the material rises.
  3. The temperature of the material rises above its ignition point (even though much of the bacteria are destroyed by ignition temperatures).
  4. Combustion begins if sufficient oxidizer, such as oxygen, & fuel are present to maintain the reaction into thermal run-away.

  Affected materials

  • Haystacks[2] and compost piles[3] may self-ignite because of heat produced by bacterial fermentation.
  • Linseed oil in a partially confined space (such as a pile of oil-soaked rags left out in an uncovered container) can oxidize leading to a buildup of heat and thus ignition.[4][5]
  • Coal can spontaneously ignite when exposed to oxygen which causes it to react and heat up when there is insufficient ventilation for cooling.[6]
  • Pyrite oxidation is often the cause of coal spontaneous ignition in old Mine tailings.
  • Pistachio nuts are highly flammable when stored in large quantities, and are prone to self-heating and spontaneous combustion.[7]
  • Large cow manure piles can spontaneously combust during conditions of extreme heat.
  • Cotton /Linen. when these materials come into contact with polyunsaturated vegetable oils(linseed, massage oils) bacteria slowly decompose the materials, producing heat. If these materials are stored in a way so the heat cannot escape, the heat build up increases the rate of decomposition and thus the rate of heat build up increases. Once ignition temperature is reached, combustion occurs with oxidizers present (oxygen).

In addition large areas of woodland, shrubland and grasslands during periods of dry hot weather are known to be capable of spontaneously combusting - though the mechanisms causing this are poorly understood. This has been proven to occur via the lifecycle of a variety of plants which require the area to be burned prior to germination.

People have also been reported as spontaneously combusting. This phenomenon is not considered true spontaneous combustion, as it is largely attributed to the wick effect, whereby an external source of fire ignites nearby flammable materials and human fat or to other sources. [8]

  Hay

Hay is one of the more studied materials in spontaneous combustion. As all hay is not equal, varying by the type of grass and location grown utilized in its preparation, it is very hard to establish a unified theory of what occurs in hay self heating. It is anticipated that dangerous heating will occur in hay that contains more than 25% moisture content. The largest number of fires occurs within 2 to 6 weeks of storage, with the majority occurring at 4 to 5 weeks.

The process may begin with microbiological activity (bacteria or mold), but at some point, the process has to become chemical. Microbiological activity will also limit the amount of oxygen available in the hay. Moisture appears to be quite important, no matter what process. At 100o C, wet hay absorbed twice the amount of oxygen of dry hay. There has been conjecture that the complex carbohydrates present in hay break down to simpler sugars, which are more readily oxidized.[9]

  Charcoal

Charcoal, when freshly prepared, can self-heat and catch fire. This is separate from hot spots which may have developed from the preparation of charcoal. Charcoal, that has been exposed to air for a period of eight days, is not considered to be hazardous. There are many factors involved, two being the type of wood and the temperature at which the charcoal was prepared. [10]

  Coal

Self-heating in coal has been extensively studied. The tendency to self-heating decreases with increasing rank of the coal. Lignite coals are more active than bituminous coals, which are more active than anthracite coals. Freshly mined coal consumes oxygen more rapidly than weathered coal, as well as freshly mined coal self-heats to a greater extent than weathered coal. The presence of water vapor may also be important, as the rate of heat generation accompanying the absorption of water in dry coal from saturated air can be an order of magnitude or more than the same amount of dry air. [11]

  Oil Seeds and oil-seed products

Moisture is a critical factor in self-heating of these materials. Typically, storage at 9-14% moisture is commonly satisfactory, but limits are established for each individual variety of oil seed. In the presence of excess moisture, but at levels below the required amount for germinating the seed, the activity of mold fungi is a likely candidate. This has been established for flax and sunflower seeds, as well as soy beans. Many of the oil seeds generate oils that are self-heating. Palm kernels, rape seed and cotton seed have also been studied. [12]

  References

Notes

Bibliography

  • Babrauskas, Vytenis (2003). Ignition Handbook. Boston: Society of Fire Protection Engineers. ISBN 9780972811132. 
  • Bowes, P. C. (1984) Self-heating: Evaluating and Controlling the Hazards, London: Department of the Environment, Building Research Establishment. ISBN 011671364

  External links

   
               

 

All translations of Spontaneous_combustion


sensagent's content

  • definitions
  • synonyms
  • antonyms
  • encyclopedia

Dictionary and translator for handheld

⇨ New : sensagent is now available on your handheld

   Advertising ▼

sensagent's office

Shortkey or widget. Free.

Windows Shortkey: sensagent. Free.

Vista Widget : sensagent. Free.

Webmaster Solution

Alexandria

A windows (pop-into) of information (full-content of Sensagent) triggered by double-clicking any word on your webpage. Give contextual explanation and translation from your sites !

Try here  or   get the code

SensagentBox

With a SensagentBox, visitors to your site can access reliable information on over 5 million pages provided by Sensagent.com. Choose the design that fits your site.

Business solution

Improve your site content

Add new content to your site from Sensagent by XML.

Crawl products or adds

Get XML access to reach the best products.

Index images and define metadata

Get XML access to fix the meaning of your metadata.


Please, email us to describe your idea.

WordGame

The English word games are:
○   Anagrams
○   Wildcard, crossword
○   Lettris
○   Boggle.

Lettris

Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.

boggle

Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !

English dictionary
Main references

Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).

Copyrights

The wordgames anagrams, crossword, Lettris and Boggle are provided by Memodata.
The web service Alexandria is granted from Memodata for the Ebay search.
The SensagentBox are offered by sensAgent.

Translation

Change the target language to find translations.
Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.

last searches on the dictionary :

2789 online visitors

computed in 0.094s

   Advertising ▼

I would like to report:
section :
a spelling or a grammatical mistake
an offensive content(racist, pornographic, injurious, etc.)
a copyright violation
an error
a missing statement
other
please precise:

Advertize

Partnership

Company informations

My account

login

registration

   Advertising ▼

Son Seals: Spontaneous Combustion (CD, Alligator Records) (7.95 USD)

Commercial use of this term

BARNEY KESSEL - SPONTANEOUS COMBUSTION NEAR MINT- LP (8.99 USD)

Commercial use of this term

SPONTANEOUS COMBUSTION "Love Comes and Goes" 45 LISTEN Rare PSYCH ROCK Rod 7" (9.99 USD)

Commercial use of this term

A & E THE UNEXPLAINED 2 SHOWS SPONTANEOUS HUMAN COMBUSTION / VAMPIRE MYTH VHS (1.99 USD)

Commercial use of this term

Search Magazine January 1965 Blackbeard Spontaneous Combustion Neo- Psychology (5.2 USD)

Commercial use of this term

SPONTANEOUS COMBUSTION - CYNTHIA BAIN LASERDISC RARE (9.95 USD)

Commercial use of this term

Society/Spontaneous Combustion (DVD, 2003) RARE ANCHOR BAY DVD BRAND NW OOP (89.0 USD)

Commercial use of this term

Spontaneous Combustion (DVD) Brad Dourif, Tobe Hooper, ANCHOR BAY DVD! NEW! OOP! (9.96 USD)

Commercial use of this term

Spontaneous Combustion, Acceptable DVD, Dick Butkus, Dale Dye, Michael Keys Hall (12.24 USD)

Commercial use of this term

6891 LP SPONTANEOUS COMBUSTION COME AND STICK YOUR HEAD IN *ORIG. PRESS* FDS-102 (13.99 USD)

Commercial use of this term

MTG Spontaneous Combustion x4 Light Play, English Tempest (1.0 USD)

Commercial use of this term

Son Seals - Spontaneous Combustion [CD New] (15.67 USD)

Commercial use of this term

MTG X4: Spontaneous Combustion - Tempest Uncommon **Super Shipping Deals** (1.0 USD)

Commercial use of this term

BARNEY KESSEL Spontaneous Combustion LP Contemporary C-14033 jazz guitar MINT (9.95 USD)

Commercial use of this term

, CD, Spontaneous Combustion (4.99 USD)

Commercial use of this term

Male Wrap-Around Blonde BRUCE MINNEY Big Rig Highway War SPONTANEOUS COMBUSTION (23.99 USD)

Commercial use of this term

Faith Madness and Spontaneous Human Combustion Callahan Immunology Science (5.99 USD)

Commercial use of this term

Spontaneous Combustion "Come & Stick Your Head In" 1969 Jazz LP,SEALED!,Original (17.95 USD)

Commercial use of this term

Secondhand Child - Chapter One: Spontaneous Human Combustion [CD New] (129.44 USD)

Commercial use of this term