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Answer:
Compressed natural gas is a fuel that can be used in place of petrol (gasoline), diesel fuel, and liquefied petroleum gas (LPG). CNG combustion produces fewer undesirable gases than the aforementioned fuels. In comparison to other fuels, natural gas poses less of a threat in the event of a spill, because it is lighter than air and disperses quickly when released. Biomethane — refined biogas from anaerobic digestion or landfills — can be used.
CNG is made by compressing natural gas, which is mainly composed of methane (CH4), to less than 1% of the volume it occupies at standard atmospheric pressure. It is stored and distributed in hard containers at a pressure of 20–25 MPa (2,900–3,600 psi), usually in cylindrical or spherical shapes.
CNG is used in traditional petrol/internal combustion engine automobiles that have been modified, or in vehicles specifically manufactured for CNG use: either alone (dedicated), with a segregated petrol system to extend range (dual fuel), or in conjunction with another fuel such as diesel (bi-fuel).
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Compressed Natural Gas (CNG) is a fossil fuel substitute for petrol, diesel and propane fuel. Its combustion produces greenhouse gases, but it is an environmentally more clean alternative to other fuels and much safer than other fuels in the event of a spill. CNG vehicles produce the fewest emissions than any other motor fuel. It may also be mixed with biogas, produced from landfills or wastewater, which does not increase the concentration of carbon in the atmosphere. CNG cylinders can be made of steel, aluminum, or plastic. Many countries in the world, including our own India, have abundant reserves of natural gas. CNG is as prevalent as petroleum products. It is the cleanest burning fuel operating today having less vehicle maintenance and longer engine life.