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Gaseous fuels have the following characteristics.
1) Also occurs in nature aside from being manufactured from solid and liquid fuels.
2) Compared to solid and liquid fuels, gaseous fuels
  a) can be conveyed easily through pipelines to its needed destination
  b) can be lighter at ease and have high heat content
  c) can be pre-heated by the hot waste gases heat
  d) combustion can be readily be controlled based on change in demand
  e) free from impurities, clean in use and do not require a special burner
  f) burn w/o soot, smoke, and ashes
  g) highly inflammable, thus can be a fire hazard