People are always confused about CNG, LPG & LNG.

Natural gas is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane in addition to various smaller amounts of other higher alkanes. Usually, they contain low levels of trace gases like carbon dioxide, nitrogen, hydrogen sulfide, and helium.

?CNG

?CNG (Compressed Natural Gas) is a gaseous combination of hydrocarbons that contains between 80 to 90% methane. Compressed Natural Gas is compressed to a pressure of 200 to 250 Kg/cm2 (to improve vehicle onboard storage in a cylinder) because of its low energy density. CNG is colorless, non-carcinogenic, and non-toxic, and it is lighter than air. It's not the same as LPG (Liquified Petroleum Gas), which is made up of liquid propane and butane.

It is superior to petrol because it costs one-third less than regular gasoline and is thus gaining popularity among car owners. Because of its lead-free nature, it is commonly referred to as "green fuel," since it decreases hazardous emissions while also being non-corrosive, extending the life of spark plugs. Another advantage seen in places where CNG is already popular is the extended life of lubricating oils since the fuel does not contaminate or dilute the crankcase oil.

?LPG

?Various liquid mixes of the volatile hydrocarbons propene, propane, butene, and butane, referred to as liquefied petroleum gas (LPG) or LP gas. It was first introduced as a portable fuel source in 1860, and its production and usage for both residential and industrial purposes have grown steadily since then. Ethane and ethylene, as well as volatile dimethyl sulphide (mercaptan), an odorant added as a safety precaution, may be included in a typical commercial mix.

Absorption is used to extract liquefied petroleum gas (LPG) from "wet" natural gas (gas containing condensable heavy petroleum components). Due to the low boiling point of the recovered product, it must be distilled to remove the lighter fractions before being processed to remove hydrogen sulphide, carbon dioxide, and water.

?LNG

Liquefied natural gas (LNG) is mostly methane that has been compressed for storage and transportation. Liquefied natural gas (LNG) is 600 times smaller than natural gas in its gaseous state, allowing it to be readily carried worldwide. LNG is created by chilling natural gas to its boiling point of minus 162 °C (259 °F) and storing it at or slightly above atmospheric pressure in double-walled cryogenic containers. By merely raising the temperature, it may be transformed back to its gaseous state.

Because LNG has the same composition as natural gas, it is more feasible than liquefied petroleum gas or other liquid gases, especially for large-scale applications. LNG production has been boosted by this fact, as well as the increased demand for natural gas. Furthermore, LNG technology has enabled the utilization of natural gas from far-flung parts of the globe where it formerly had little commercial use and was flared (burned). LNG carriers deliver LNG from nations like Qatar, Australia, Indonesia, and Algeria to markets in China, Europe, and Japan, and are equipped with supercooled cryogenic tanks.

With the construction of natural gas pipelines in the early twenty-first century, the United States became a net exporter of LNG, when it had previously been a major importer. LNG is generally regasified (converted to a gaseous form) at the receiving country's import terminals, where it may be injected into natural gas pipelines and transported to power plants and distribution firms for different industrial applications.

Automobile manufacturers have been testing LPG/CNG in dedicated and bi-fuel modes in their cars. While these fuels will not completely replace gasoline and diesel, they may be aimed at certain markets, such as commercial and public vehicles. For a long time, diesel was thought to be environmentally benign since it is more fuel-efficient than gasoline, providing 15-20% greater mileage per liter. However, since the 1990s, diesel has been increasingly recognized as being severely harmful to one's health and the environment. Experiments have shown that except from a very small - one micron or less - which are harmful to health.

Alternative fuels such as compressed natural gas (CNG) and liquefied petroleum gas (LPG) will be commonly applied in vehicles in the next millennium.