Combustion and Flame

Solids (wood, coal)

Requirements for Combustion

Fuel

Oxygen

Ignition Temperature

Solids (wood, coal)

Liquids (kerosene, petrol)

Gases (natural gas)

Supports combustion

Result of comburstion

Heat (Released during combustion)

Light (Often produced during combustion)

Types of Combustion

Rapid Combustion (e.g., burning wood)

Slow Combustion (e.g., rusting of iron)

Spontaneous Comburstion(e.g.,forest fires, yellow phosphorus)

Explosion(e.g., fire crackers)

Flame

Structure of a Candle Flame

Outermost non-luminous zone

MIddle luminous zone

Dark inner zone

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Lowest blue zone

Calorific Value

Amount of heat produced per 1 kg fo fuel

SI unit = joule per kelogram(J/kg)