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
Correct Answer: A
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