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3.  Bituminous: it is formed as more pressure is applied to lignite coal. The greater the force
               applied the more water is expelled, which increases the amount of pure carbon present and
               increases the heat content of the coal. It contains 70-86% of carbon. This is also used to
               generate electricity.

            4.  Anthracite: it is considered the highest grade of coal. It has very light weight when compared
               to other coals. It’s very hard and is dark brown in colour. It contains 86-92% of carbon and
               produces large amount of heat. It can also be used for power generation.



        Coal as a source of energy: Coal is mainly carbon. When heated in air, coal burns and produces
        mainly carbon dioxide gas. A lot of heat energy is also produced.

                             Carbon   +   Oxygen                      Carbon dioxide    +   Heat

        Uses of Coal:

              It is used as fuel in homes and industries.
              It is used at thermal power plants to generate electricity.
              It is used to make coal gas which is an important industrial fuel.
              It is used to make coke.






















































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