question_answer

Define calorific value.

A) It is the amount of heat which is given out by a unit mass of a fuel on complete combustion in air

B) It is the amount of heat which is given out by a fuel on complete combustion in biogas

C) It is the amount of heat which is given out by a fuel in the combustion in methane

D) It is the amount of heat which is given out by a unit mass of a fuel on complete combustion in natural gas

E)  None of these