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  • Combustion is the process in which combustible substances burn in the presence of excess of oxygen to produce heat and light.
  • Flame is formed when the vapors of the combustible substances catches fire.
  • Fuels are the substances which readily burn in oxygen to produce heat and light. They form the source of energy.
  • Ignition temperature is the minimum temperature needed for any combustible substances to catch fire.
  • Global warming is due to excess release of carbon dioxide gas in to the atmosphere, as the result of burning fuels like coal, petrol, diesel etc.
  • Acid rain is formed when Sulphur dioxide and oxides of Nitrogen released from chemical industries dissolve in rain water.

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