Question

distinguish between Rapid and spontaneous combustion

Answer 1

☆Spontaneous combustion
1.The combustion in which substances suddenly burst into flames, without the application of any apparent cause is called spontaneous combustion.
2.For example, sodium and phosphorus burn spontaneously in air, even when no external heat is provided to them

☆Rapid combustion
1.The combustion in which substances burn rapidly to produce heat and light is called rapid combustion. In rapid combustion, external heat must be supplied so that the substances can burn.
2.For example, when a burning matchstick is brought near a gas stove (with its knob turned on), LPG burns rapidly to produce heat and light

Answer 2

Distinguished between rapid and spontaneous combustion
In Rapid combustion a substance burn rapidly producing heat and light
while in spontaneous combustion is the type of combustion which occurs without an external ignition source.

OR


Rapid combustion is to external heat is required to start it once while
in spontaneous combustion no external heat required to start it.