Question

Define ignition temperature of a substance. ​

Answer 1

Answer:

Ignition temparature: It is the lowest temperature at which a combustible substance when heated takes fire in air and continues to burn.

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Answer 2

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Define ignition temperature of a substance.

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If the ignition temperature of a substance (minimum temperature at which a substance catches fire) is lower than the room temperature then it will burn spontaneously i.e. no external substance is required to burn the fuel.

This kind of combustion is known as spontaneous combustion.