Explosion is a sudden chemical reaction that takes place with the evolution of a large amount of:

Oxides of sulphur and dissolve in rainwater and form acid rains.

Carbon dioxide as fire extinguisher not only forms a blanket around the fire, it also brings down the temperature of the fuel.

An example of spontaneous combustion is cold dust, forest fire which is

Fuel efficiency is expressed in terms of its calorific value of kJ/kg

The substances like kerosene, oil and molten wax which vaporize during burning forms flames whereas charcoal does not vaporize, do does not produce flames.

The non-luminous zone of the flame is the innermost zone which is used by goldsmiths for melting gold and silver.

Incomplete combustion of a fuel gives poisonous carbon monoxide.

A chemical process in which a substance reacts with oxygen to give heat is called explosion.

Inflammable substances have very low calorific value.