As the world looks for cleaner alternatives to highly polluting fossil fuels like petrol and diesel, CNG has emerged as one of the most popular and eco-friendly fuels for public and private transport.
CNG is lighter than air. If there is a leak, the gas quickly rises and disperses into the atmosphere, making it less likely to catch fire on the ground compared to liquid petrol.
It is completely odorless, colorless, and tasteless. A chemical odorant is added to it so people can smell leaks.
LPG (Liquefied Petroleum Gas), used in home kitchens, is different; it is made of Propane and Butane and is heavier than air.
The full form of CNG is Compressed Natural Gas.
CNG is natural gas (which is primarily Methane, $CH_4$) that has been compressed down to less than 1% of its standard atmospheric volume. It is stored in hard, thick, cylindrical or spherical tanks at very high pressure (around 200 to 250 bars).
CNG is considered a green fuel because of its chemical properties:
Generally, CNG provides better mileage (fuel efficiency per kg) and is significantly cheaper than petrol, though it reduces the car's engine power slightly.
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