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Combustion & Flame

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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Combustion & Flame

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  1. Combustion & Flame By Vishnu M Nair

  2. 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

  3. Basic Needs

  4. 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

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

  6. We now understand that fire be seen with the help of the above Q1. What will you do if you see a uncontrolled fire?

  7. How to extinguish fire? 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

  8. For Example • 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

  9. 2. By taking away the fuel 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

  10. In such a case 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

  11. The Ignition Temperature 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

  12. Given here are some fuels and its ignition temperature

  13. Inflammable substance 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

  14. Rapid Combustion and Spontaneous Combustion

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

  16. Rapid Combustion and Spontaneous Combustion 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

  17. Zones of Candle Flame

  18. Explosion 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.

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

  20. Know more on fuels A Good Fuel – A good fuel is:- • Readily Available • Cheap • Burns easily in air • And does not leave any undesirable substance behind.

  21. Fuel Efficiency 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).

  22. Burning of fuels leads to harmful products

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

  24. A bear that lost his home because of ice melting

  25. Acid Rain 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.

  26. Acid rain

  27. THE END

  28. Done By Vishnu Hope you liked it ?

  29. For More Slide shows Log on to www.slideshare.wordpress.com

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