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.
Give two examples of solid and liquid fuel.

Explanation

To answer the question, "Give two examples of solid and liquid fuel," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Fuel**:
- A fuel is a material that can be burned to produce heat. It typically contains carbon and hydrogen as its main combustible elements.

2. **Identify Solid Fuels**:
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