Coal and Petroleum
Coal is a hard, black, combustible substance mainly composed of carbon. It is one of the most widely used fossil fuels in the world.
Coal was formed from the remains of plants that lived in dense forests millions of years ago. These plants were buried under layers of soil and rocks. Over time, heat and pressure converted the dead plant matter into coal.
This slow process of formation of coal is called carbonization.
Coal is mainly found deep underground and is extracted through mining.
3. Coal Mining
Underground Mining
In underground mining, deep tunnels are dug into the Earth to reach coal deposits. Miners enter these tunnels to extract coal. This method is used when coal is located deep below the Earth's surface.
Open-Cast Mining
In open-cast mining, coal deposits that are close to the surface are extracted by removing the upper layers of soil and rock. This method is easier and safer compared to underground mining.
4. Products of Coal
Coal is not only used as fuel but also processed to obtain useful substances. The three main products obtained from coal are:
- Coke
- Coal Tar
- Coal Gas
Coke
Coke is a tough, porous, black substance obtained by heating coal in the absence of air. It contains almost pure carbon and is mainly used in the manufacturing of steel and in the extraction of metals from their ores.
Coal Tar
Coal tar is a thick black liquid with a strong smell. It contains many chemical substances used in the production of synthetic dyes, drugs, naphthalene balls, plastics, perfumes, and road materials.
Coal Gas
Coal gas is a fuel gas obtained during the processing of coal. It was earlier used for lighting and heating and is now mainly used as industrial fuel.
5. Petroleum
Petroleum is a dark, oily liquid found deep underground between layers of rocks. It is also called crude oil.
Petroleum was formed from the remains of tiny plants and animals that lived in ancient seas millions of years ago. Over time, heat and pressure transformed them into petroleum.
Petroleum is extracted using oil wells from underground reservoirs.
6. Petroleum Refining
Crude petroleum cannot be used directly. It must be separated into useful components through petroleum refining.
This process is carried out in petroleum refineries using a method called fractional distillation, where crude oil is heated and separated based on boiling points.
7. Products of Petroleum
- Petroleum Gas (LPG)
- Petrol
- Kerosene
- Diesel
- Lubricating Oil
- Paraffin Wax
- Bitumen
These products are widely used in transportation, industries, and households.
8. Natural Gas
Natural gas is mainly composed of methane and is considered a clean fuel because it produces less pollution compared to coal and petroleum.
- Cooking fuel (PNG)
- Vehicle fuel (CNG)
- Electricity generation
- Manufacturing fertilizers and chemicals
9. Petrochemicals
Petrochemicals are products obtained from petroleum and natural gas.
- Plastics
- Synthetic fibres
- Detergents
- Medicines
- Synthetic rubber
- Fertilizers
10. Non-Renewable Natural Resources
Coal, petroleum, and natural gas are non-renewable resources because they are available in limited quantities and take millions of years to form.
11. Conservation of Fossil Fuels
- Using public transportation
- Switching off vehicles when not in use
- Using energy-efficient appliances
- Promoting renewable energy
- Reducing unnecessary fuel consumption
Conclusion
Coal and petroleum are important fossil fuels that provide energy for industries, transportation, and electricity generation.
However, these fuels are non-renewable and excessive use can lead to environmental pollution. Therefore, it is important to conserve fossil fuels and adopt sustainable energy practices.