Question

Define 'colorific value of a fuel'.​

Answer 1

Answer:

Calorific value is the heat liberated when 1 kg of fuel burns completely in oxygen.

The SI unit is

joules/kg

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Answer 2

The energy contained in a fuel or food, determined by measuring the heat produced by the complete combustion of a specified quantity of it. This is now usually expressed in joules per kilogram.

THIS IS DEFINATION FROM GOOGLE.

IN SIMPLE WORDS...

Calorific value of a fuel is

$\frac{heat \: produced}{quantity \: of \: fuel}$

Quantity of fuel should be written as much fuel is burnt.

I hope it helps you