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Coal and petroleum

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coal and petroleum

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Coal and petroleum

  1. 1.  The resources which are present in unlimited quantity in nature are not likely to be exhausted by human activites.  eg:sunlight,air
  2. 2.  The resources which are present in limited quantity in nature and are likely to be exhausted human activities.  eg:forests,coal,minerals.
  3. 3. Some exhaustible natural resources like coal, petroleum and natural gas were formed from the dead remains of living organisms (fossils).So these are called fossil fuels.
  4. 4.  Coal is as hard as stone and is black in colour.  Coal is one of the fuels used to cook food.  Coal is also used in thermal power plants to produce electricity.
  5. 5.  It is tough, porous and black substance.  It is an almost pure form of carbon.  Coke is used in the manufacture of steel and in the extraction of many metals.
  6. 6.  It is a black, thick liquid with an unpleasant smell.  It is a mixture of about 200 substances.  Products obtained from coal tar are used as starting materials for manufacturing various substances used in every day life in industry, like synthetic dyes, drugs, explosives, perfumes etc.  Naphthalene balls used to repel moths and other insects are also obtained from coal tar.  These days, bitumen, a petroleum product, is used in place of coal tar for metalling the roads.
  7. 7.  Coal gas is obtained during the processing of coal to get coke.  It is used as a fuel in many industries situated near the coal processing plants.  Coal gas was used for street lighting for the first in London in 1810.
  8. 8.  Petrol is used as fuel in light automobiles.eg: motor cycles, cars etc.  Heavy motor vehicles like truck, tractors etc, run on diesel.  Petrol and Diesel are obtained from a natural resource called Petroleum.  Petroleum is dark oily liquid. It has an unpleasant odour.
  9. 9.  The petroleum conservation research association (PCRA) advises people how to save petrol/diesel while driving. Their tips are:  Drive at a constant and moderate speed as far as possible.  Switch off the engine at traffic lights or at a place where you have to wait.  Ensure correct tyre pressure.  Ensure regular maintenance of the vehicle.
  10. 10.  Petroleum is a mixture of various constituents such as petroleum gas, petrol, diesel, lubricating oil, paraffin wax etc.  The process of separating the various constituents of petroleum is known as refining.  It is carried out in petroleum refinery.
  11. 11.  Natural gas is a very important fossil fuel because it is easy to transport through pipes.  Natural gas is stored under high pressure as compressed natural gas (CNG).  CNG is used for power generation.  It is now being used as a fuel for transport vehicles because it is less polluting. It is a cleaner fuel.
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    Jan. 30, 2016

coal and petroleum

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