in which fuel we can get non luminous flame? name the fuel and explain why?
Answers
Answer:
Charcoal is a solid fuel which does not vaporise on heating.So,charcoal does not burn by producing a flame. Coal is a solid fuel which does not vaporise on heating.So,coal also does not burn by producing a flame.
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Answer:
A chemical process in which a substance reacts with oxygen to give off heat and light is called combustion.
The burning of wood is an example of combustion.
Combustion and Flame 01.png
Combustible and Non-Combustible Substances
Substances, which easily catch fire are combustible substances, such as paper, coal, wood.
Substances, which do not catch fire readily are non-combustible substances, such as sand, water, glass.
History of Wood and Candle Flame
Fuel
Any substance, which upon combustion produces a usable amount of energy is known as fuel. For example, fossil fuels, biogas, nuclear energy etc.
Fuels can be solid, liquid or gas depending on their state.
On the basis of their occurrence, it can be either natural or artificial.
For More Information On History of Candle Flame, Watch The Below Video:
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Ignition Temp
The lowest temperature at which a combustible substance catches fire when heated in the air is called its ignition temperature.
Inflammable Substances
The substances, which have very low ignition temperature and can easily catch fire with a flame are known as inflammable substances. Examples: diesel, LPG, acetone.
Fire
Fire is the result of a chemical combustion reaction between oxygen and some sort of fuel.
How long a fire lasts depends on how much fuel and oxygen are available.
Candle Flame
Fire Triangle
For the generation of fire, we need three things to be present simultaneously:-
Some sort of fuel or combustible material.
A heat source to raise the temperature of the fuel to its ignition temperature.
Enough oxygen to sustain combustion. So, if we remove any one of these resources, the fire can be controlled.
Combustion and Flame 02.png
Flame
Flame is the visible and gaseous part of the fire.
What we see as the flame is the light energy released due to the combustion of fuel.
Zones of Candle Flame
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Structure of Flame
The outermost zone is the hottest among all zones and is blue in colour, and this is due to complete combustion. It is the non-luminous part of the flame.
The middle zone of the candle flame is moderately hot and is yellow in colour, and partial combustion of fuel takes place. It is the bright part of the flame.
The innermost zone of the flame is the least hot and is black in colour. This is due to the presence of unburnt wax vapours.
Combustion and Flame 04.png
Smoke
Smoke is an example of solid (unburnt particles) dispersed in a gas (air).
The black colour of smoke is due to the presence of unburnt carbon particles in the smoke.
Explanation: