Differentiate between rapid combustion and spontaneous combustion

Rapid Combustion:

1. Rapid combustion is a type of combustion in which a large amount of heat and light are released in a short period of time.
2. This type of combustion usually requires an external source of heat to start the reaction.
3. An example of rapid combustion is the burning of a candle or a gas stove. In both cases, we need to light the wick or the gas to start the combustion.

Spontaneous Combustion:

1. Spontaneous combustion occurs when a material suddenly bursts into flames without any apparent external source of ignition.
2. This type of combustion happens when a material heats up through a process called self-heating. This can occur due to chemical reactions or the material absorbing moisture.
3. An example of spontaneous combustion is the ignition of hay piles, which can self-heat and eventually catch fire.