What is calorific value ?

In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 KJ. Calculate the calorific value of a the fuel.

Name the unit in which calorific value of a fuel is expressed.

Which among the folowing is the unit of calorific value of fuel ?

Arrange the fuels in the order of Increasing calorific value: LPG, Cowdung cakes, Petrol, Coal, Hydrogen gas.

Biogas contains 70% methane. The calorific value of methane is 55 kJ/kg. If a family requires 10,000 kJ of energy per day, how much biogas is needed per day?

What is the economic value of spirulina?