Answer :

Spontaneous combustion is the type of combustion in which the combustible material suddenly starts burning into flames without applying any external agent.

● Such combustion is observed in forest fires where dry leaves catch fire on getting heat from the sun or catch spark from lightening.

● We also observe spontaneous combustion in case of match stick in which phosphorous readily starts burning from the heat generated by friction on rubbing.

When a material burns rapidly to produce heat and light on applying an external agent to it, such combustion is called rapid combustion.

● Rapid combustion is observed in gas stoves in kitchen where the gas burns rapidly on bringing a lighter or burning matchstick near to it.

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