Types Of Combustion

key notes :

What is Combustion?

  • Definition: Combustion is a chemical reaction in which a substance reacts with oxygen to release heat and light.
  • Examples: Burning of wood, candle, and fuels like petrol or diesel.

Types of Combustion

Rapid Combustion

  • Definition: A type of combustion that occurs quickly and releases heat and light in a short time.
  • Examples: Burning of LPG, paper, and kerosene oil.
  • Key Feature: Requires an external source to initiate (like a matchstick).

Spontaneous Combustion

  • Definition: A type of combustion that occurs automatically without an external heat source.
  • Examples: Forest fires due to heat buildup in dry leaves, coal dust catching fire.
  • Key Feature: Triggered by internal factors like temperature or chemical reactions.

Explosive Combustion

  • Definition: A type of combustion that occurs instantaneously with a loud sound and the release of a large amount of gas, heat, and light.
  • Examples: Firecrackers, dynamite explosion.
  • Key Feature: Very fast reaction accompanied by an explosion.

Complete Combustion

  • Definition: Combustion in the presence of an adequate supply of oxygen, producing carbon dioxide and water as by-products.
  • Examples: Burning of natural gas.
  • Key Feature: Produces a clean flame with maximum energy.

Incomplete Combustion

  • Definition: Combustion in the presence of limited oxygen, producing carbon monoxide or soot as by-products.
  • Examples: Burning of wood in a closed space.
  • Key Feature: Produces less heat and more pollutants.

Conditions Necessary for Combustion

  • Fuel: A substance that burns (e.g., wood, coal, petrol).
  • Oxygen: Acts as the supporter of combustion.
  • Ignition Temperature: Minimum temperature required to ignite the substance.

Safety Measures During Combustion

  • Avoid flammable materials near an open flame.
  • Store fuels in proper containers.
  • Ensure proper ventilation during combustion to avoid harmful gas buildup.

Applications of Combustion

  • Used in vehicles (internal combustion engines).
  • Power generation.
  • Cooking and heating.

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