Combustion and fossil fuels
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Combustion is the process of burning a substance in the presence of oxygen, producing light and heat. It involves exothermic chemical reactions between a fuel and an oxidant. Burning produces light and heat. LPG is useful for cooking. Combustible substances burn to produce light and heat, while non-combustible substances do not. Spontaneous combustion occurs without an ignition source through heat buildup during oxidation. Rapid combustion releases a lot of heat and light quickly, and sometimes gas.
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combustion
The document defines combustion as a chemical process where a substance reacts with oxygen in air to produce heat and light. There are several types of combustion described, including spontaneous, rapid, complete, and incomplete combustion as well as explosions. Rapid combustion occurs when a substance burns quickly, producing heat and flame, often with the introduction of external heat. Incomplete combustion results in only partial burning of a fuel due to a lack of oxygen or low temperature, producing carbon monoxide. For combustion to occur, there must be a combustible substance, a supply of oxygen (air), and enough heat to raise the substance to its ignition temperature.
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• Explain the theories underlying combustion processes
• Describe how fire researchers have identified combustion processes using a variety of different classifications
• Provide a description of the stages and events of fire as it progresses from the initial stage to its final stage
• Explain the causes of flame over, flashover, and backdraft and review the procedures to prevent and protect against such events
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• Explain the theories underlying combustion processes
• Describe how fire researchers have identified combustion processes using a variety of different classifications
• Provide a description of the stages and events of fire as it progresses from the initial stage to its final stage
• Explain the causes of flame over, flashover, and backdraft and review the procedures to prevent and protect against such events
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1. A combustion reaction occurs when a fuel and oxidant react, producing light and heat.
2. The fire triangle refers to the three components needed for combustion - heat, oxygen, and fuel.
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Here are the answers to your questions:
1. The three essential conditions necessary for combustion are:
- Presence of a combustible substance
- Presence of a supporter of combustion like oxygen
- Attainment of ignition temperature of the substance
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3. No, the process of rusting cannot be called combustion because it does not involve burning in the presence of oxygen with the liberation of heat and light. Rusting is a slow oxidation reaction between iron and oxygen/water.
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Ch1,ch2
The weight of a 1 kg mass where the acceleration due to gravity is 9.75 m/s^2 is 9.75 N.
Weight = mass x acceleration due to gravity
= 1 kg x 9.75 m/s^2
= 9.75 N
So the weight of a 1 kg mass in the given conditions is 9.75 N.
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Chapter - 6, Combustion and Flame, Science, Class 8
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IGNITION TEMPERATURE
INFLAMMABLE SUBSTANCE
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CBSE Class 8 / VIII General Ccience Power Point Presentation
Prepared By
Praveen M Jigajinni
DCSc & Engg,PGDCA,ADCA,MCA,MSc(IT),MTech(IT), M.Phil (Comp Sci)
For Any Queries Please feel free to contact:
Email Id : praveenkumarjigajinni@gmail.com
Cell No: 9431453730
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Combustion and fossil fuels
- 2. WHAT IS COMBUSTION ? Combustion is defined as the process of burning of a substance in the presence of air or oxygen with the liberation of light and heat. Or Combustion or burning is the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species.
- 3. LETS SEE SOME IMAGES.
- 4. WHAT DO BURNING A SUBSTANCE PRODUCE ? • Burning a substance produces Light and heat HOW IS LPG USEFUL TO US? • LPG is used for Cooking
- 5. COMBUSTIBLE SUBSTANCES Substances that burn in air to produce light and heat are called combustible substances Eg- Paper , Wood , Kerosene , LPG .
- 6. NON-COMBUSTIBLE SUBSTANCES Substances that do not burn in air to produce light and heat are called combustible substances Eg-Water , Sand , Glass , Cement .
- 7. SPONTANEOUS COMBUSTION Spontaneous combustion is a type of combustion which occurs without an external ignition source. It is usually a slow process that can take several hours of decomposition/oxidation with heat build up to a point of ignition. • Coal can spontaneously ignite when exposed to oxygen which causes it to react and heat up when there is insufficient ventilation for cooling. • Pyrite oxidation is often the cause of coal spontaneous ignition in old Mine tailings. • Pistachio nuts are highly flammable when stored in large quantities, and are prone to self-heating and spontaneous combustion. • Large cow manure piles can spontaneously combust during conditions of extreme heat.
- 8. RAPID COMBUSTION It’s a Type of combustion where lot of heat and light is released in a short time span. Sometimes, a large volume of gas is liberated in combustion besides the production of heat and light.
- 9. COMPLETE COMBUSTION In complete combustion, the reactant burns in oxygen, producing a limited number of products. When a hydrocarbon burns in oxygen, the reaction will only yield carbon dioxide and water. When elements are burned, the products are primarily the most common oxides. Carbon will yield carbon dioxide, nitrogen will yield nitrogen dioxide, sulfur will yield sulfur dioxide, and iron will yield iron(III) oxide.
- 10. INCOMPLETE COMBUSTION Incomplete combustion occurs when there isn't enough oxygen to allow the fuel to react completely to produce carbon dioxide and water. It also happens when the combustion is quenched by a heat sink such as a solid surface or flame trap.
- 11. EXPLOSION The sudden evolution of large quantities of gas creates excessive pressure that produces a loud noise. Combustion need not involve oxygen; e.g., hydrogen burns in chlorine to form hydrogen chloride with the liberation of heat and light characteristic of combustion.