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Combustion & Flame. By Vishnu M Nair. Index. Basic needs How to extinguish Fire The Ignition temperature Inflammable combustion Rapid & Spontaneous Combustion Zones Of Candle Flame Explosion Fuel Fuel Efficiency Global Warming Acid Rain. Basic Needs.

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Presentation Transcript

Combustion & Flame

By

Vishnu M Nair


Index
Index

Basic needs

How to extinguish Fire

The Ignition temperature

Inflammable combustion

Rapid & Spontaneous Combustion

Zones Of Candle Flame

Explosion

Fuel

Fuel Efficiency

Global Warming

Acid Rain



Basic needs1
Basic Needs

The major conditions for a fire to burn is

  • The presence of Oxygen

  • The presence of fuel

  • The temperature to reach flash point


Basics of combustion and flame
Basics of Combustion and Flame

Combustion – A chemical process in which a substance reacts with oxygen to give off heat is called combustion.


We now understand that fire be seen with the help of the above

Q1. What will you do if you see a uncontrolled fire?


How to extinguish fire
How to extinguish fire? above

The answer to that question is so simple.

Fire can only burn with presence of oxygen and fuel and if temperature is above flash point.

So to extinguish fire remove away any of these


For Example above

  • By denying the access of oxygen

    Example: If fire is on a human body we should cover him tightly with a blanket like that on the picture below


2. By taking away the fuel above

3. By decreasing the temperature below flash point

This can be done by poring water over the fire

Q. What will you do if the fire is caused by an electric short circuit


In such a case above DO NOT TRY TO EXTINGUISH IT WITH WATER.

As water may come in contact with electric shock which could lead to serious injuries or even DEATH


The ignition temperature
The Ignition Temperature above

The lowest temperature at which a substance catches fire is called its Ignition Temperature

It is essential for a substance to reach its ignition temperature to burn



Inflammable substance
Inflammable substance above

The Substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances

Some examples are: Petrol, Alcohol, Liquid Petroleum Gas



Rapid combustion and spontaneous combustion1
Rapid Combustion and Spontaneous Combustion above

Rapid Combustion: Gas burns rapidly and produces heat and light. Such combustion is known as rapid combustion.


Rapid combustion and spontaneous combustion2
Rapid Combustion and Spontaneous Combustion above

Spontaneous Combustion: The type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called Spontaneous Combustion



Explosion
Explosion above

When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. A large amount of gas formed in the reaction is liberated. Such a reaction is called explosion.


Fuel above

The substance that undergoes combustion is said to be combustible or FUEL


Know more on fuels
Know more on fuels above

A Good Fuel – A good fuel is:-

  • Readily Available

  • Cheap

  • Burns easily in air

  • And does not leave any undesirable substance behind.


Fuel efficiency
Fuel Efficiency above

The amount of heat produced on complete combustion of 1 kg fuel is called its calorific value. The calorific value is expressed in a unit called kilojoules per kg (kj/kg).



Global warming
Global Warming above

Combustion of most fuels releases carbon dioxide in environment. Increased carbon dioxide in air is believed to cause global warming


A bear that lost his home because of ice melting
A abovebear that lost his home because of ice melting


Acid rain
Acid Rain above

Burning of coal and diesels releases sulphur dioxide gas. Oxides of sulphur and nitrogen dissolve in rain water and forms acids.

Such a rain is called acid rain.



THE END above


Done By above

Vishnu

Hope you liked it ?


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