what is the state of matter of flame?
359096
You mentioned candles and as these are composed of Hydrocarbons I'd refer you to Hinshelwood (Step Reactions), but you asked this in Physics, not Chemistry. \n\nSimply put, A candle flame consists of different molecular combinations of Carbon, Hydrogen and Oxygen.  They are not ionised but are neutral (some of these as free radicals). The valence electrons are highly energised and (as they fall to lower Molecular orbitals) emit photons  - some of which are in the visible range.\n\nSo not (an ionised) plasma - just a hot gas!
560162
Fire is the rapid combination of oxygen with fuel in the presence of heat, typically characterized by flame, a body of incandescent gas that contains and sustains the reaction and emits light and heat. (from www.straightdope.com)\n\nThe typical, bright, yellowish-orange upper part of a flame is due to the heating of unburned carbon particles.\n\nThe temperature of the fire and the material being burned are the factors that determine the color of the flame. The various colors of flames in a wood fire are due to the different substances in the flames.
628384
In chemical qualitive analysis, this is known as a flame test.  Many metals (and some non-metals) have distinctive colors.\n\nThe heat of the flame excites one or more electrons of the metal atom causing it to go to a higher energy state.  When the electron returns to the "ground state" electromagnetic energy is released and this appears as light of a specific color.
146566
A flame is a mixture of gases undergoing a chemical reaction that gives off enough heat to continue the reaction in the molecules that have not yet reacted.  We get the impression that solids (like wood) burn, but it's really mainly the gases coming off of them that burn.  That's why it's easier to start a hot piece of wood on fire than a cold piece of wood.  The initial piece has to be hot enough so that the flamable products escape from it in vapor form.
289306
appearance, color, physical state, density, heat conductivity, electrical conductivity, melting point, boiling point.
957050
all things have a solid liquid and gas state. it just depends on the temperature.
259791
As mentioned by someone previously the "firey" part of fire is plasma, which is a fluid composed of free electrons and positive ions (atoms stripped of one or more electrons). Plasma is sometimes referred to as the "4th state of matter".\n\nThe light you see is emitted when electrons "move" from an atomic orbital of higher potential energy to an orbital of lower potential energy, the potential energy of the electron being converted to light. The colour of the light depends on precisely what the energy difference is, and in the case of standard fire the colour we see is actually a mixture of many colours.
280179
Well I could make it as complex and confusing as some but I will keep it simple.  The color of a flame is determined by the material that is burning. The color also denotes temperature of a flame. (yes there are different degrees of hot). Sodium will give a yellow flame. Have a gas stove? Notice the flame has two colors of blue, the inner flame is a different shade than the outer shade, look at a match, the flame closest to the center of flame is yellowish while the outer is reddish. The center is hotter in both flames.\nAdding a chemical to the fire will change color, copper will burn blue, both from chemical and its flame hotter than the average yellow fire.  The quantity of flame or size is why we cant tell the difference in heat from all these small flames and we say they are hot.
1159688
The density, the atomic structure, and the state of matter it is in.
950120
you need to be more specific!\n  The flame test is a test of physical properties.\nWhen a atom has energy added into it, the electrons move from a lower energy level to a highewr energy level.  They are unstable in this position and return to lower energy levels.  In the process they release energy, some in the form of visible light that we see as the color of the flame.
1089368
A flame is an action of combining fuel, oxygen and heat.  therefore it is a burning of (gases) \nEven solid fuel is converted into gas state prior to becoming a flame
437126
Plasma - fire is considered to be an example of a substance in this state.
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Matter is anything that has Mass and takes up space.  The general properties of matter are mass, weight, volume and density.   They are considered physical properties.\n\nLook around you and you will see matter.  Air is matter because it takes up space.  Heat and light does not have mass or takes up space, so it is not matter.  \n\nScientists have separated matter into states or phases.  Prior to 1985 there were 4 states or phases, today we have 5 states or phases.  Each of these phases certain properties associated with each phases.  Matter can be changed from one state or phase to another phase by energy.  There are five types of phase changes.
931030
That should only happen with copper or copper salts.\nIt's the oxidation of the copper in the flame.\nAll elements burn differently, this is the basis of how a spectrometer works.
1113770
If it were possible to extract the heat, it would self-extinguish and cease to be a flame. You can have an invisible flame with no colour, if I remember rightly, burning pure alcohol produces this.
876351
When something burns the vapor given of by the reaction between the fuel, oxygen and heat is what is actually burning.  The flame goes up because this vapor is less dense than the surrounding air.
408192
you need three things to create a flame:  heat, oxygen, and fuel.  In the air, you have oxygen.  The phosphorous is the fuel, so if you apply a heat source, you will see a flame.  I don't know what makes a firefly glow.