Whats the lowest temperature a flame can be?

Question

I was just thinking of this, anyone any ideas?

I meant just any flame

Answer 1

Candle flame is a low temperature flame. You can just insert your finger rapidly into the flame without getting burnt. I have also seen people in India keeping burning camphor in their palm (standing in front of deities) as a sort of worship.

Normally, yellow sooty flames will have low temperature and blue flames such as Bunsen flame will have high temperature (around 700 degree C). Welding flames will have around 1200 deg. C, if I remember well.

Answer 2

Do you mean the lowest temperature which is possible in a steady-state flame, or the lowest temperature at which spontaneous ignition can take place?

The latter temperature is much lower, because there are chemical compounds which spontaneously burn when brought into contact pretty much irrespective of their temperatures at the time. A simplistic case is sodium metal and water; the sodium will burn even in water which is just above the freezing point.

When two such compounds spontaneously ignite when brought into contact, they're referred to as being "hypergolic". The "reaction control system" (RCS) steering rockets on the shuttle use nitrogen tetroxide and monomethyl hydrazine, which are kept liquified in the fuel tanks, so presumably they are at very low temperatures when mixed before they combust.

Of course, once they light off, the temperature rises quite rapidly. But even if it didn't, they'd combust anyway. Combustion is not maintained by temperature in such reactions.

Answer 3

A flame is simply luminous vapour or gas. Carbon disulphide (nasty stuff) burn with a flame coole enough to put your hand in.
There must be other materials like this.
Some of these answers are soooo silly.

Answer 4

This is a really good question.
I would be inclined to say that the temperature varies depending on the material you're using for fuel.

Answer 5

If you mean a visible flame, then it would need to be about 600C before it starts to radiate in the visible spectrum.

Answer 6

so a strategies as i be conscious of paper has a organic ignition element at 451degrees F. this is the coldest i be conscious of of...even regardless of the undeniable fact that timber could be chillier ? right this is a table from between the Google sites.... gas gas Combustion with Oxygen (oC) Combustion with Oxygen and with Air (oC) Acetylene 3,a hundred... 2,4 hundred Butane ...a million,970 Carbon Monoxide ...2,121 Ethane ...a million,960 Hydrogen 2,660 ... 2,0.5 MAPP1) ...2,980 Methane 2,810 ... a million,957 organic gas ... 2,770 Propane 2,820 .... a million,980 Propane Butane mixture .... a million,970 Propylene .... 2,870 yet another table under... Flame Temperatures gas Flame Temperature acetylene 3,a hundred °C (oxygen), 2,4 hundred °C (air) blowtorch a million,3 hundred °C (2,4 hundred °F, air) Bunsen burner a million,3 hundred-a million,six hundred °C (2,4 hundred-2,900 °F, air) butane a million,970 °C (air) candle a million,000 °C (a million,800 °F, air) carbon monoxide 2,121 °C (air) cigarette 4 hundred-seven hundred °C (750-a million,3 hundred °F, air) ethane a million,960 °C (air) hydrogen 2,660 °C (oxygen), 2,0.5 °C (air) MAPP 2,980 °C (oxygen) methane 2,810 °C (oxygen), a million,957 °C (air) organic gas 2,770 °C (oxygen) oxyhydrogen 2,000 °C or greater (3,six hundred °F, air) propane 2,820 °C (oxygen), a million,980 °C (air) propane butane mixture a million,970 °C (air) propylene 2870 °C (oxygen)

Answer 7

Hydrogen is flammable, its liquid form is -270C so assuming its liquid state can be ignited, A VERY COLD FLAME!!!

Answer 8

100 C init ?