Is fire considered a gas or soild?
how does Oxygen fuel fire?
Does it change
the chemical reaction or is it the force of the
oxygen that spreads the burning substance? -
|Question Date: 2008-10-15|
1. Fire is neither a gas nor a solid in itself.
It is a chemical process which turns one material
into another. The fuel can be solid (coal),
liquid (gasoline), or gas (methane), and the
results are often gas (usually carbon
2. Fire needs 3 things: fuel,
oxygen (or an oxidizer), and heat or spark.
Again, fire is a chemical reaction between oxygen
(or an oxidizer) and the fuel. Using pure oxygen
instead of air allows the chemical reaction to go
faster because each molecule of fuel has more
chances to interact with a molecule of oxygen.
It's like having more available dance partners.
Removing the oxygen stops the chemical reaction.
When we have some source of carbon (say a lump
of sugar sucrose,) and some oxygen (the air we
breathe is 21% oxygen) then a combustion reaction
occurs. This reaction can be
12 CO2+ 11H20
called a combustion reaction the products of the
reaction are water and carbon dioxide. now when
some sugar (or a lump of coal) burns, the gases
given of, CO2 and steam are hot...very
hot and small impurities in the substance burning
give a color to the flame...so the flame is simply
the hot gases derived from the combustion process.
So fire per se is just the term we use for the
visualization of those hot gases.Without diatomic
oxygen written O2 where the two should
be a SUBSCRIPT there could be no combustion
reaction. Actually the combustion reaction is a
type of OXIDATION reaction. In the case of
burning, the carbon goes from a reduced state to
an oxidized state (as CO2).
Another burning (oxidation reaction
is...RUST!!! in that reaction native metal Fe
combines with oxygen to make hematite or rust
Fe +3/2 O2=
So we can say
that formation of blood red rust is simply the
'burning' of iron!!!
I hope this answers
your question Chemistry is a very important area
of study... the drugs that may some day cure
cancer, the supplies you use to make buildings and
computers and even the evolution of the planet
earth are all examples of chemical processes.
Chemistry is really fun stuff. I got interested in
it when I was a kid because I used to make and fly
model rockets and we used to make our own rocket
1. There are lots of states of matter besides
gases and solids and liquids. Fire isn't a solid.
Fire burns fuels to make gases. The fuels are
mostly solids or liquids, or gases that are
different from the gases that are produced by the
fire. Sometimes the fire can't, or doesn't, burn
up the fuel completely. Then there are things
such as ashes or charcoal after the fire is
2. Oxygen combines with the chemicals
in the fuel to make new chemicals that have oxygen
in them. When that happens really fast, it is a
fire. Sometimes oxygen combines slowly with
chemicals, and there is no fire. Two processes I
can think of where oxygen combines slowly are: 1,
iron, when it rusts, and
2, fats and oils,
when they get rancid.
3. The oxygen reacts
chemically with the fuel when there is a fire.
Other things can be happening, too. For example,
wind can spread burning things to other places.
Most of the forces that are big enough to measure
would all be from things such as wind and not from
the actual reaction of oxygen with fuel. However,
fire makes heat, and heat can exert forces on
things. Have you ever seen angel chimes that ring
when you put them above a candle? The heat from
the candle pushes on a little 'pinwheel' at the
top of the angel chimes. The pinwheel moves
around and around when the heat pushes on it, and
the angels go around on the pinwheel, and little
metal rods hanging from the angels hit the sides
of little bells.
1. Fire is a chemical reaction, not a
substance. Therefore it cannot be either a solid
or a gas. The chemicals that are reacting usually
consist of oxygen (which is a gas), and one or
more forms of fuel, which can be solid, liquid, or
they can also be gases.
2. Oxygen combines
with other elements to form compounds that are in
a more favorable, lower energy state, than the raw
elements themselves. The energy lost from going
from a high energy state to a low energy state has
to go somewhere, and so becomes heat.
chemical reaction, including fire, requires a
certain amount of heat in order to proceed. What
makes fire different from many other chemical
reactions is that the fire itself generates the
heat necessary to cause the reaction to continue
occurring, and by heating up neighboring
substances, can raise them to the temperatures
where they start to burn as well. Of course, in
order for fire to happen, all of the ingredients
need to be present: Fuel will nor burn without
oxygen, and likewise oxygen cannot burn by itself
either, even if the needed heat is present.
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