Rapid Combustion
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- When substances burn swiftly and produce heat and light.
- Example: when a burning matchstick or gas lighter is brought near a gas stove, the gas burns rapidly, exemplifying rapid combustion.

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Spontaneous Combustion
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- This refers to a type of combustion where a material spontaneously bursts into flames without any apparent external cause.
- Substances like phosphorus can ignite in air at room temperature.
- Instances include coal dust causing fires in coal mines due to spontaneous combustion.
- Natural causes like sunlight or lightning can lead to spontaneous forest fires.
- However, human negligence, such as leaving campfires unextinguished, is often the major cause of forest fires.

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Explosion
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- An explosion occurs when a sudden reaction results in the rapid release of heat, light, sound, and gas.
- Example: Fireworks during festivals. When a cracker is ignited, it leads to an explosion.
- External pressure applied to a cracker can

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Flame Diversity: Colors, Vaporization, and Zones
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Details
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- LPG flame and candle flame have distinctive colours.
- Substances that evaporate during burning form flames.
- Example: Kerosene and molten wax.
- Charcoal doesn’t produce a flame as it doesn’t vaporise.
- The luminous zone of a flame indicates the presence of unburnt carbon particles.
- The non-luminous zone is the hottest part of the flame, often used by goldsmiths for melting precious metals due to its high temperature.

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