1. Compressed Natural Gas

2. CNG (Compressed natural gas) is a fossil fuel substitute for gasoline (petrol) used in cars and locomotives such as trains. made of methane ADVANTAGES CNG does not contain any lead, thereby eliminating fouling of spark plugs. CNG-powered vehicles have lower maintenance costs than other hydrocarbon- fuel-powered vehicles.

3. CNG fuel systems are sealed, preventing fuel losses from spills or evaporation. Increased life of lubricating oils, as CNG does not contaminate and dilute the crankcase oil. Being a gaseous fuel, CNG mixes easily and evenly in air. CNG is less likely to ignite on hot surfaces, since it has a high auto-ignition temperature (540 °C), and a narrow range (5–15 percent) of flammability. Less pollution and more efficiency: CNG emits significantly fewer pollutants (e.g., carbon dioxide (CO 2 ), unburned hydrocarbons (UHC), carbon monoxide (CO), nitrogen oxides (NO x ), sulfur oxides (SO x ) and PM (particulate matter) than petrol.

4. Top 10 countries with the largest CNG vehicle fleets - 2012 (millions) RankCountry Registered fleet RankCountry Registered fleet 1 Iran 3.306 China 1.50 2 Pakistan 3.107 Italy 0.74 3 Argentina 2.188 Ukraine 0.38 4 Brazil 1.739 Colombia 0.38 5India1.5010Thailand0.35

5. Comprehension Questions: (answer in your notebooks) 1.Find the meaning of the underlined words. 2.What is CNG and where is it made from? 3.Why does it increase the life of lubricating oils? Print the file.