Define calorific value of a fuel.

The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value. The calorific value of a fuel is expressed in a unit called kilojoule per kg (kJ/kg).

Non-luminous zone.

Foam type fire extinguisher.

Heating up of the earth's atmosphere due to trapping up of the infrared radiation by carbon dioxide in the atmosphere is called global warming. 

Carbon tetra chloride fire extinguisher.