Question

1. What are fuels?
2. Define ignition temperature.
3. What are the different stages of coal formation. Explain the first stage.
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Answer 1

$\color{red}{QUESTION~1}$

What are fuels?

$\color{blue}{ANSWER}$

A fuel is any material that can be made to react with other substances so that it releases energy as heat energy or to be used for work

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$\color{red}{QUESTION~2}$

Define ignition temperature.

$\color{blue}{ANSWER}$

The autoignition temperature or kindling point of a substance is the lowest temperature in which it spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark. This temperature is required to supply the activation energy needed for combustion

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$\color{red}{QUESTION~3}$

What are the different stages of coal formation. Explain the first stage.

$\color{blue}{ANSWER}$

There are four stages in coal formation: peat, lignite, bituminous, and anthracite. The stage depends upon the conditions to which the plant remains are subjected after they were buried: the greater the pressure and heat, the higher the rank of coal.

Explanation of 1st stage in pic

refer to the pic :)

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Answer 2

Answer:

Answer 1. A fule is a material that can be made to react with other substances so that it release energy

or to be used for work.

Answer 2, 1. The lowest temperature at which a substance catches fire is called ignition temperature

1. combustible substances cannot catch fire or burn as long as it's temperature is lower than its ignition temperature.
2. kerosene oil and wood do not catch fire on there own at room temperature,

but if kerosene oil is heated a little it will catch fire.

Answer 3. is in the attachment .....

keep smiling army!!!!