Talk:Fire triangle

Wiki Education Foundation-supported course assignment

This article was the subject of a Wiki Education Foundation-supported course assignment, between 7 September 2020 and 18 December 2020. Further details are available on the course page. Student editor(s): Nturne22.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 21:16, 17 January 2022 (UTC)

Wiki Education Foundation-supported course assignment

This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Johny UT.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 21:25, 16 January 2022 (UTC)

Tetrahedron

Tetrahedron is not that good, create one and recreate.

Add in info from sources, link.—Preceding unsigned comment added by -Slash- (talk • contribs)

Would you care to explain what you think is bad about them? And what do you mean by "Add in info…"? Captions in the article? Descriptions on the image pages?. –Gustavb 08:59, 2 February 2007 (UTC)

Notes to self. Pay no attention to the rambling man. Your tetrahedron is not perfect - I can't seem to remember what was wrong with the triangle. {Slash-|-Talk} 21:18, 3 February 2007 (UTC)

Gas ovens

Question: where is the heat when a gas oven lights from a spark? This seems to be a common case which the triangle is insufficient to explain, since no fuel, oxidizer or heat has been added. Neodymion (talk) 16:38, 6 July 2009 (UTC)

Sparks are usually pretty hot. Visible sparks from a flint are particles of metal that are hot enough to incandesce, and visible electric sparks are a form a plasma with energy equivalent to a few thousand degrees. DMacks (talk) 16:53, 6 July 2009 (UTC)

Pressure

Question: pressure is only described to be a possible contributor to activation energy; but I've found no examples or research indicating that fire can start without pressure, or continue without it, and some to the contrary. Is this simply something that has been excluded because on the surface of the earth pressure is ubiquitous? Or is there some other more compelling reason for the omission? -- thisma^talk 19:37, 3 March 2017 (UTC)

Energy from combustion of aluminium

The article talks about the energy release of a fire, giving an example of "up to 7.550 calories/kg for aluminium". But the Standard enthalpy of formation of Al₂O₃ is −1675.7 kJ/mol. The molar mass of the oxide is is 101.96 g/mol and the atomic weight of aluminium is 26.982 g/mol, so by hand-waving math:

$(-1675.7{\frac {10^{3}J}{molAl_{2}O_{3}}})({\frac {1}{2*26.982}}{\frac {molAl_{2}O_{3}}{10^{-}3kgAl}})({\frac {1}{4.184}}{\frac {cal}{J}})=-31.052x10^{6}{\frac {cal}{kgAl}}$

Even if "7.550" is really a European thousands separator, the value and order of magnitude seem waaaaaay off. Anyone have a direct cite? DMacks (talk) 15:05, 5 April 2017 (UTC)

While not a source for 7.550 calories/kg, I found this: https://www.osti.gov/servlets/purl/4412534/

Which gives a heat of combustion in 25 atm. oxygen = 7405.6 cal/gram. While not the same number, it does look similar, and someone might have made some mistakes with regards to real calories vs. american "calories" (kilocalories).--5.179.95.66 (talk) 12:31, 21 March 2019 (UTC)

Heat

The need for fire to have heat to begin or continue seems less obvious than the other two. Fuel and oxygen are components of the chemical reaction, but heat does not appear to be.

Can someone add an explanation to the statement "Without sufficient heat, a fire cannot begin, and it cannot continue." — Preceding unsigned comment added by 49.178.25.210 (talk) 10:08, 8 July 2017 (UTC)

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Fire triangle concepts

Hello, I am a student at the University of Oregon. I am taking a fire and natural disturbance course and would like to help on this page. In Fire triangle, I would like to add to the description of what is a fire triangle and add the fire diamond and use the resource of our class text book. I would like to elaborate on the idea that the triangle can change as space, size, and time of fire progresses. As the size of a flame moves to wildfire with addition of more oxygen the fire grows by production of weather and climate. Johny UT (talk) 15:28, 27 October 2017 (UTC)

References