A substance that burns to give a large amount of heat at a reasonable cost is called a fuel. A fuel contains carbon and hydrogen as main combustible elements. Fuel is any material that can be made to react with other substances so that it releases chaemical or nuclear energy as heat or to be used for work. We use different kinds of fuels in our daily lives, such as coal, wood, petrol, diesel, LPG and CNG. Read the below questions and try to answer them.
Discuss the calorific value of a fuel.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Calorific Value:**
The calorific value of a fuel is defined as the amount of heat energy produced when a specific quantity (usually 1 kg) of the fuel is completely burned in the presence of oxygen.

2. **Complete Combustion:**
Complete combustion occurs when a fuel reacts fully with oxygen, producing carbon dioxide and water as the main products. This process releases a significant amount of heat energy.

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