Natural gas, a mixture of light hydrocarbons has clean burning characteristics led to increment of its use in vehicles as a clean fuel. Natural gas contains mostly methane and ethane. These light gases have very high vapor pressure at ambient temperature and their storage require high pressure compression or reduction of temperature extremely.
Natural gas comprising more than 20 percent of methane has been used as a fuel for vehicles and that’s because of the low cost and less environmental effects relative to gasoline. Methane, the main component of natural gas, is in gas phase at STP condition. As it has very low density, for unit volume of methane, low amount of energy will be produced, requiring high amounts to be stored in tanks.