Question

the quantity of heat produced by unit mass of a fuel on complete combustion​

Answer 1

Answer:

Calorific value is the amount of energy released or produced when 1 kg of fuel burns or any other substance is burnt in the presence of oxygen and the products of combustion are cooled to STP. Its SI unit is kJ/kg.

Answer 2

$Calorific \: leqslant \: value \: is  \: the \: amount  \: of \: energy \\ released \: or  \: produced \:  when \: 1 \: kg \: of \:  fuel  \\ burns \: or \: any \: other \: substance \: is \: burnt \\ in \: the \: presence \: of \: oxygen \\ and \: the \: products of  \: combustion \:  are \: cooled \: to \: STP. \\ It's \: SI \:  unit \:  is \: kJ/kg.$