when burn something ,why gasess come from it?

Answer 1

When u r burning something it reacts with oxygen present in the air. Generally it omits CO2 and other oxides, depending on what you are burning.

Answer 2

Combustion or burning is a complex sequence of chemical reactions between a fuel and an oxidant accompanied by the production of heat or both heat and light in the form of either a glow or flames.

In a complete combustion reaction, a compound reacts with an oxidizing element, and the products are compounds of each element in the fuel with the oxidizing element. For example:



A simpler example can be seen in the combustion of hydrogen and oxygen, which is a commonly used reaction in rocket engines:


The result is simply water vapor.

In the large majority of the real world uses of combustion, the oxygen (O2) oxidant is obtained from the ambient air and the resultant flue gas from the combustion will contain nitrogen:


As can be seen, when air is the source of the oxygen, nitrogen is by far the largest part of the resultant flue gas.

In reality, combustion processes are never perfect or complete. In flue gases from combustion of carbon (as in coal combustion) or carbon compounds (as in combustion of hydrocarbons, wood etc.) both unburned carbon (as soot) and carbon compounds (CO and others) will be present. Also, when air is the oxidant, some nitrogen will be oxidized to various, mostly harmful, nitrogen oxides (NOx).

in short gasses come out because some elements like carbon contained in the matter combines with oxygen (are oxidized) and turn into coarbondioxide or their respec tive oxides.

Answer 3

IN SOLID THE MOLECULES ARE TIGHTLY FIT TOGETHER,WHEN WE BURN IT THE MOLECULES BECOME ENERGETIC AND THE DISTANCE BETWEEN THEM DECREASES AND IT CHANGES INTO LIQUIDS. WHEN LIQUIDS ARE HEATED THE DISTANCE INCREASE AS THE MOLECULES BECOME ENERGETIC AND THE GASES ARE FORMED.

Answer 4

IN SOLID THE MOLECULES ARE TIGHTLY FIT TOGETHER,WHEN WE BURN IT THE MOLECULES BECOME ENERGETIC AND THE DISTANCE BETWEEN THEM DECREASES AND IT CHANGES INTO LIQUIDS. WHEN LIQUIDS ARE HEATED THE DISTANCE INCREASE AS THE MOLECULES BECOME ENERGETIC AND THE GASES ARE FORMED.

Answer 5

i think there is some moisture in every thing and when we burn it then that moisture get off in form of vapours and in gases. these gases are the moisture contents and te vapour form of that material.

Answer 6

ususally, most things have carbon in them. this carbon combines with oxygen to form CO2, which u see as a gas (smoke!)