Question

What are fuels? Give two examples of modern fuels.

Answer 1

Fuels:

• The substances which are burnt to produce a large amount of energy in the form of heat and light are called fuels.
• These are the substances that can be made to react with other substances so that it releases energy as thermal energy or to be used for work.

$\mathrm{Fuel}+\mathrm{Oxygen}\stackrel{\mathrm{burning}}{\to }\mathrm{Energy}+\mathrm{carbon}\mathrm{dioxide}(\mathrm{heat}+\mathrm{light})+\mathrm{water}$

Examples:

1.CNG (compressed natural gas)

2.LPG (Liquefied petroleum gas)